1、commit
犯(罪);做(坏事)
I have never committed any crime.
我从来没犯过罪。
This is a man who has committed murder.
这是一个杀人犯。
拨出，调配(资金、资源等)
They called on Western nations to commit more money to the poorest nations.
他们呼吁西方国家向极端贫困国家投入更多的钱。
The government had committed billions of pounds for a programme to reduce acid rain.
政府已经给一个旨在减少酸雨的方案拨了几十亿英镑。
承诺，保证(做);忠于(某人)
I would advise people to think very carefully about committing themselves to working Sundays.
我建议大家慎重考虑一下答应周日工作的问题。
I'd like a friendship that might lead to something deeper, but I wouldn't want to commit myself too soon.
我希望拥有一份能进一步发展的友谊，但又不想太快作出承诺。
2、come back
回忆起;回想起来
He was also an MP — I'll think of his name in a moment when it comes back to me.
他当时也是一位国会议员，他的名字我得想一下才能记起来。
When I thought about it, it all came back.
当我回想起来，往事全都涌上了心头。
重新流行;再度时兴
I'm glad hats are coming back.
我很高兴又开始流行戴帽子了。