A prototype arm braces objects above the head holds tools and frees both hands of kneeling workers.

一个原型手臂支撑着头顶上方的物体，拿着工具，解放了跪着的工人的双手。

' It takes two goes for the man, his arm braced against the back of the cab, to hear me.

’那个男人用了两下，他的手臂支撑在驾驶室的后面， 听到了我的声音。

A head taller than everyone else, and walking a little tentatively through the crowd, his arm braced slightly in front of him, as if he were wary even now that someone would bump into him.

比所有人都高出一个头， 在人群中有些试探性地走着，手臂在身前微微撑着， 仿佛现在就在提防着有人会撞到他。