The paper also contains a nice little experiment with airborne collision avoidance systems.

该篇论含一个很棒的小实验，是关于机载撞系统的。

Why do you think your whole building is made out of nerf?

不然你那整栋楼怎么都是撞材料造的？

Sure, said Roy. His ears were getting hot under his crash helmet.

当然，罗伊说。他的撞头盔下的耳越来越热。

Ken Stonex helped GM Design a so-called crash proof highway test site called " The Proving Ground" .

Ken Stonex 帮助通用汽车设计了一个名为“试验场”的所谓撞高速公路试验场。

Nekhludoff walked around the house where he saw two disheveled women, one of whom was evidently pregnant, standing near the staircase. On the stairs, with his hands in the pockets of his crash overcoat, stood the clerk.

聂赫留着屋子走来走去，看见两个衣冠不整的女人，其中一个显然怀孕了，站在楼梯旁。店员站在楼梯上，双手插在撞大衣的口袋里。