口語課堂第56期:絞盡腦汁;分心

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rack one's brains to try very hard to think of something 絞盡腦汁,苦思冥想

I've been racking my brains all day trying to remember his name.
我一整天都絞盡腦汁,想要回憶起他的名字.

sidetrack:to make somebody start to talk about or do something that is different from the main thing that they are supposed to be talking about or doing 使轉變話題;使轉移目標

I was supposed to be writing a letter but I'm afraid I got sidetracked. 我本來應該在寫信,但後來恐怕是分心幹別的去了.