1.Bike helmet自行车头盔；单车头盔

It turns out he'd gone to the garage to get his bike helmet and found two helmets there.

原来他已经去了车库取他的自行车头盔，并且在那儿找到两个头盔EOF+ec#ip]cl|CZmSU4。

2.have a concussion 脑震荡

I think I might have a concussion.

我想我可能有脑震荡Zx@Z(pJP%8ot。

3.black box黑匣子

At the highest level of abstraction, we can view the system as a single entity (complex whole), or black box.

在抽象的最高级别上，我们可以将系统视作一个单个实体（复杂整体），或黑盒_kVefICUUfv~5AyLWw*w。