The difficulty is which one to choose.
困难的是要选择哪一个。
How you going to know which one to go for?
你怎么知道该选哪一个呢？
Rather speak of something at which one may laugh heartily.
说一些让人开怀大笑的事情吧。
A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species.
共生关系是两个或多个物种之间的相互作用，其中一个物种生活在另一个物种体内，或依靠这一物种生活。
Gause performed numerous tow-species experiments in the laboratory, in which one of the species became extinct when only a single kind of resource was available.
高斯在实验室里进行了许多双物种实验，其中一个物种在只有一种单一资源的情况下就灭绝了。
He dictated a letter, which one of his clerks wrote out a beautiful round hand, and then the two brothers sat at the window a whole day watching for the right man to give it to.
他口述了一封信，其中一个员工用漂亮的圆体字写了下来。接着，两兄弟在窗边坐了一整天，等待把信交给一位合适的人。
I can't tell which one is her best book as I am not familiar with her books.
我不知道哪一本是她最好的书，因为我不熟悉她的书。
If my friend was thinking about leaving her career, but didn't know which one to choose, I would first recommend her to search for work that best fits her values.
如果我的朋友想要辞职却不知该如何选择的话，我会首先建议她去找一份最符合她价值观的工作。
The rare disorder, in which one side of the brain grows substantially larger than the other, occurs when neurons in the abnormal hemisphere undergo too many cell divisions before they mature.
当异常半球中的神经元在成熟之前经历过多的细胞分裂时，就会发生这种罕见的疾病，即大脑一侧长得比另一侧大得多。
The Russian biologist G. F. Gause performed numerous tow-species experiments in the laboratory, in which one of the species became extinct when only a single kind of resource was available.
俄罗斯生物学家G. F.Gause在试验室进行了大量的两个物种的实验，试验中，当只有单一的资源时，其中一个物种将会灭绝。
You never know which one you will get, so there isn't a cure for each one.
你永远不知道你会得哪种病，所以不可能每种病都能有治愈的办法。
Historical records document a group-oriented existence, in which one room was used for eating, entertaining guests, and sleeping.
历史记录记载了一种以群体为导向的生活方式——吃饭、招待客人和睡觉都在一个房间进行。
After participants had tasted or smelled both samples, they indicated which one they preferred.
在参与者尝过或闻过两种样品后，他们指出他们更喜欢哪种。
"Wow, I'm going to be like Essien!" And they started arguing which one would make it as a superstar.
“哇，我要成为埃辛了！”他们开始争论谁会成为超级巨星。
Actual loss will depend upon the particular frequencies to which one is exposed, and whether the sound is continuous or intermittent.
实际的损失将取决于暴露的特定频率，以及声音是连续的还是间歇的。
肯定要自由，但要哪一种？
Mommy, Mommy, which one is best for me?
妈咪，妈咪，我买哪一样最好呢？
But which one comes first, happiness or success?
但是幸福与成功之间，到底孰先孰后？
No matter which one, our purpose is to let you learn.
无论哪一个，我们的目的都是让你学会。
If you could live as an animal, which one would you choose?
如果你可以像一种动物那么生活，你会选择哪一种？
You can try on these brooches to see which one you like.
你可以试试这几个胸针来看看你喜欢哪件。
If not, which one could you focus on during the next week or two?
如果没有，接下来的一两周你打算专注于哪一点呢？
Explore one of our hotels and see which one suits you the best.
是不是心动了？ 先来看看我们的酒店，看哪家最适合你。
If you can't decide which one to do, try them all, see what you like.
如果不知道做哪个，那就都试试，看你喜欢哪一个。没有喜欢的？
Is there anything of which one can say, "Look! This is something new"?
岂有一件事人能指着说：“这是新的”？
There are things which one must not attempt to depict; the sun is one of them.
有些事是不该试着描绘的，太阳就是其中之一。
I enjoy English, biology and chemistry. But which one should I choose to study at university?
我喜欢英语，生物和化学，但在大学我应该选择哪一门学科学习呢？
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