If astronomers could observe metallicity gradients in spiral galaxies billions of light-years away, we could see how steep the gradients were billions of years ago and thus how they change over time.
如果天文学家能够观测到十亿光年外的螺旋星云的金属丰度梯度，我们就可以知道亿万年之前的梯度有多大，因此也就可以知道它是如何随时间变化的。
They don’t take the time to observe the ground beneath their feet. Hence, they are incapable of seeing and feeling the optimal way forward.
若人们没有花时间观察所处的环境，那么也无法认清和感受到最佳的前进道路。
They don't take the time to observe the ground beneath their feet. Hence, they are incapable of seeing and feeling the optimal way forward.
若人们没有花时间观察所处的环境，那么也无法认清和感受到最佳的前进道路。
And it is simple: Both animals and people learn more readily when they can observe and even compete with others learning at the same time.
这很简单：动物和人类在学习东西的时候，如果能够观察别人怎么做，甚至与之竞争，它(他)们就会更加积极地去学。
With the new device, researchers can observe cells in real time as they grow in a three-dimensional collagen scaffold under precisely controlled chemical or physical conditions.
利用该新设备，研究人员可以实时观察细胞，因为它们生长在一个精确控制的化学或物理条件下的三维胶原支架中。
According to the rules, those who book the seat have the priority to use the seat, but they also have to observe a time limit.
根据规定，用微信在线预约选座的人有优先使用所选座位的权利，但是必须要遵守时间限定。
And the Jews undertook to observe with solemnity all they had begun to do at that time, which Mardochai by letters had commanded to be done.
犹太人便把已开始举行的和摩尔德开给他们规定的事，奉为永远当守的盛典。
So you see, the outer signs …It's not the first time I've noticed this - the doctors observe all the outer signs, then they declare you dead, but you're still in your body!
因此你瞧，外在的标志……我已不是第一次注意到这个了——医生观察所有的外在标志，然后他们宣布人死去，但是人仍然还呆在他的身体里！
If you observe some kids playing, they don't give much time or attention to worrying about what they're doing or even how they look.
观察儿童玩耍，你会发现孩子根本不担心自己在做什么，或自己看起来如何。
If you observe some kids playing, they don't give much time or attention to worrying about what they're doing or even how they look.
观察儿童玩耍，你会发现孩子根本不担心自己在做什么，或自己看起来如何。
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