为何不能用键盘呢？ 因为容易分心。

Why you shouldn’t use a keyboard: distractions.

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最大限制的进行保护，因为容易传播性传染疾病。

Protection is of the utmost importance, as STIs can easily be transmitted.

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橡皮小熊糖没再喂给它们，因为容易粘牙。

Gummy bears were abandoned because they stuck to the monkeys' teeth.

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And in terms of equations that we use, it's sometimes easier to plug in the fact, since momentum is equal to mass times velocity.

在我们使用方程这方面，事实上有时是很容易代入的，因为动量等于质量乘以速度。

麻省理工公开课 - 化学原理课程节选

It's very hard to start an insurance company because you've got to meet the requirements of all fifty regulators.

开办保险公司是非常不容易的,因为你必须同时满足五十个州的监管要求

耶鲁公开课 - 金融市场课程节选

So in terms of the first step of skeletal structure, this is actually going to be easier because we don't have a central atom, we just have carbon and nitrogen here.

对于第一步画出骨架，其实比刚才更容易,因为我们没有一个中心原子，我们这里只有碳和氮两个原子。

麻省理工公开课 - 化学原理课程节选