下件最重要的事是工作台面维护。

Next most important thing is the maintenance of countertop.

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下件大事是什么？

What's the next big thing?

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下螺母凸顶的滑动零件上有一条小弧线充当楔块。

A small curve in the sliding part of the convex top of the lower nut acts as the wedge.

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So if you wanna do something conditionally, you generally needs to ask the question, is the following true or false.

假如想在一定条件下做一件事情，你需要判断下这个条件，来看看条件是真还是假。

哈佛公开课 - 计算机科学课程节选

I of course picked the wrong day to wear a sweatshirt under really hot lights so thankfully I came prepared with another item from the-- from the store.

当然，我在主光灯下穿了件运动衫，这确实不太明智,幸好我过来时,从商店准备了另一件。

哈佛公开课 - 计算机科学课程节选

Second thing we've been doing, I want to highlight for you is, we've along the way, mostly just verbally rather than writing it down, but we've been talking about good style.

我们一直在学的第二件事情是,我想给大家强调下，我们一直在口头上说，而没有把它写下来，但是我们一直在说优秀的风格。

麻省理工公开课 - 计算机科学及编程导论课程节选