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expose to暴露于
例句：Don't expose it to the sun.
谨防日晒。
Don't expose undeveloped film to light.
不要把未冲洗的胶卷暴露在光照下。
2.There was no apparent tension between the two leaders after their meeting, although President Zardari's comments that "storms will come and storms will go" did hint at the turbulent backdrop.
hint at暗示(某事)
例句：What on earth are you hinting at?
你到底在暗示什么?
I hinted at his imprudence.
我曾暗示他的不谨慎。
3.The feeble rate at which the private sector is hiring has led a number of economists to ask if the US could be headed for a double-dip recession.
head for朝…进发
例句：We saw him heading for us, so we stepped aside.
我们看见他向我们走来, 就让到一边。
He put on his coat and headed for the door.
他穿上大衣向门口走去。
4.Officials at the mine in Atacama in the north of the country say the men were cut off after the main access tunnel collapsed.
cut off切〔隔〕断, 阻碍
例句：Our troops cut off the enemy's retreat.
我们的军队切断了敌人的退路。
