Do you like writing by hand or with a keyboard?

你喜欢手写还是用键盘打字？

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Covalent catalysis involves the substrate forming a transient covalent bond with residues in the active site or with a cofactor.

共价催化涉及底物与活性位点中的残基或与辅因子形成瞬时共价键。

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Train with a friend or with a group of friends.

和朋友或者一群人一起训练。

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Think of your family or friends. How well would those relationships work without trust or with a broken trust?

VOA: special.2009.12.19

So we can have, if we have the final quantum number m equal plus 1 or minus 1, we're dealing with a p x or a p y orbital.

所以如果我们有,磁量子数ｍ等于正负１,我们讨论的就是ｐｘ或者ｐｙ轨道。

麻省理工公开课 - 化学原理课程节选

Or maybe you want a friend to join the gym with you. So that you can exercise together.

又或者，你希望找一个朋友跟你一起去健身，这样你们俩就可以一块锻炼了。

Why don't 课堂 - SpeakingMax英语口语达人

You either drink it neat or with a drop of water to open the flavours.

BBC: Why you should never drink whisky on the rocks

Friedland claims he wants to develop the Mongolian mine himself, or with a partner.

FORBES: Companies & Strategies

Go in advance to the restaurant you choose, by yourself or with a friend.

FORBES: Magazine Article