Japan is racking up record trade surpluses with the United States.

日与美国的贸易顺差正在创新高。

I’ve been racking my brains all day trying to remember his name.

我一整天都绞尽脑汁，想要回忆起他的名字。

All night I have been tossing and turning racking my brains to think what could have possessed the young man to kill himself.

整整一晚我辗转反侧, 绞尽脑汁, 想是什么原因竟能促成这个年轻人自杀。