1. mess with: 搞糟；干擾

eg. You are messing with people's religion and they don't like that.
你正在干涉人們的宗教信仰，他們不喜歡你這樣做。

eg. Be confident, don't let anyone mess with your dream
要自信，不要讓任何人干擾你的夢想。

2. keep down: 控制

eg. The government tried to keep down the rebels.
政府試圖鎮(zhèn)壓反叛者。

eg. Economies of scale and limited investment choice will keep down charges.
規(guī)模經(jīng)濟(jì)和有限的投資選擇會(huì)控制費(fèi)用不會(huì)太高。

3. You never know. 世事難料

eg. I'd like to hope that but you never know.
我希望如此但你永遠(yuǎn)也不知道結(jié)果如何。

eg. But the world is full of wonders, so you never know.
但是，世界無奇不有，所以你永遠(yuǎn)不會(huì)知道會(huì)發(fā)生什么。