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The system can be an open system, or it can be a closed system, or it can be isolated.
系统可以是开系，可以是闭系，或是孤立系。
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They have these things called tiger tails which you like, tie onto your pants and it's like "I'm a little tiger."
他们有这些被称作“老虎尾巴”的东西，当你把它系到你的裤子上，你自己就仿佛是只“小老虎”。
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An open system, as the name describes, allows mass and energy to freely flow through the boundary.
开系，顾名思义，允许质量和能量自由地,流过它的边界。
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And if you remember this phrase, I don't know why you would, but this will help you learn the lanthanides in order.
如果你能记得这句话的话，我不管你们是怎么做到的，但是这个确实会帮助你按顺序记住镧系元素。
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Before that, people used to put papers in piles, tie them up in ribbons, and put them on bookshelves or in drawers.
在此之前，人们经常将纸堆起来，用丝带卷好系上，然后放在书架上或是抽屉里。
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This pluripotent stem cell is able to self-renew and it's able - generating committed progenitors of either the myeloid or the lymphoid lineage.
这种多能干细胞能自我更新,也可以生成定向祖细胞,可以是髓系祖细胞或者淋巴祖细胞
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OK, to work. A word of warning: fasten your seat belts.
好了，开始工作，一些警告的话：,系紧你们的安全带。
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I tie a spring to my back and I anchor it to the wall and see how much the spring stretches before the two forces balance.
我把弹簧一端系在背后,另一端固定在墙上,观察两个力平衡时弹簧的伸长量
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Take a match to the department.
别真的带火柴到系上来。
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I am convinced--even though I'm sure that the Toyota Motor Company didn't organize it this way— I am convinced that on my automobile when I do not plug in my safety belt that there is a bell ringing "DING, ding, ding, DING, ding, ding."
我相信,尽管我确信,丰田汽车公司不会这样组织,我确信在我车上,当我没有系上安全带的时候,会有响铃,"叮,叮,叮,叮,叮,叮"
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Especially in the United States, it's a law that you have to wear your seatbelt.
尤其在美国，法律规定开车时必须系好安全带。
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So, remember when you're looking at your periodic table, don't forget about the lanthanides, sometimes they come into play.
因此，要记住，当你在看元素周期表时，不要忘了镧系元素，有时候也会用到它们。
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And for Americans, all our democratic experience and do I have to put a tie on for this event or not?
美国人也如此,我们都参与民主政治,知道在什么场合需要系领带,比如现在
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I also was a grad student here in the '80s, in the Religious Studies Department.
980年代，我曾在此攻读硕士学位，在耶鲁的宗教研究系。
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One could similarly have a course devoted to the problem of free will.
我们系同样还开设有一门课,专门讨论自由意志问题
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The libertarian says it may be a good thing if people wear seatbelts but that should be up to them and the state, the government, has no business coercing them, us, to wear seatbelts by law.
自由主义者说，系安全带也许是件好事,但这应由人们自己作主,政府没有资格,用法律来强迫人们系安全带。
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Bind them as a sign on your hand and let them serve as a symbol on your forehead; inscribe them on the doorposts of your house and on your gates.So love and loyalty to God is the foundation of the Torah but Torah is the fulfillment of this love and loyalty: studying it and observing it and teaching it and transmitting it.
也要系在手上为记号，戴在额上为经文,又要写在你房屋的门框上，并你的城门上,那么对上帝的爱和忠诚是律法卷的基础，但律法卷,是这种爱和忠诚的实现：学习它，观察它,教授它，传播它。
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Let's say your little brother is just learning how to tie his shoes.
假设你的弟弟正在学习怎么系鞋带。
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and you can find the department the professor is in,
然后找到教授所在的系，
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The thermos, with the lid on top, It's not a open system your coffee is going to stay warm or hot in the thermos.
顶部盖了盖子的热水瓶，不是开系,你希望你的咖啡在热水瓶里面保持温暖,或滚烫。
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The closed system allows energy to transfer through the boundary but not mass.
闭系允许能量通过它的边界传递,但质量不行。
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For example, if I isolated this one called the myeloid cell, it's capable of forming red blood cells, megakaryocytes and neutrophils.
比如,如果我分离出一个髓系细胞,它就能生成红细胞,巨核细胞和嗜中性粒细胞
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Already from the very opening lines we see in this a clue to the theme that is going to follow.
打从一开始,我们即看出这条线索,连系到即将发生的主题。
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system is the opposite of the open system, no mass and no energy can flow through the boundary.
孤立系与开系正相反，没有质量或能量,能流过它的边界。
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As soon as lanthanum takes that electron, this level rises ever so slightly, and then we jump down here and fill in the lanthanide.
一旦镧得到了电子，这一层就会稍稍上升，然后我们向下填一下镧系元素。
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And a lot of the strikes that you see in high schools and in-- I better get to my lecture,but-- you see in high schools and even in middle schools, have to do with the State,somebody saying, well we're going to take away two-hundred teachers in your department, or we're going to maintain a curriculum that doesn't seem to make any sense.
在高中里可以看到很多罢课,我最好回到正题,但还是再讲一点,在高中,甚至在初中有很多罢课,为了反对政府的某项规定,比如说要在这个系减少两百个教师,或者主张一份,完全不合理的课程安排
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And the person you're with is not wearing their seatbelts.
你车上的朋友并没有系上安全带。
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All right. The other thing I have to teach you is matter-energy interaction so that we can see how the Balmer series validates the Bohr model.
好的，我要教你们的里一个知识点是,物质能量的相互作用，我们可以见证,巴尔末线系是怎样证实波尔模型的。
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The Earth seems to be a pretty good inertial system, because on the ground, you leave something, it stays there.
地球看上去是个不错的惯性系,因为什么东西放在地上,都会保持静止
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