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'Perfume, eh?' he asked sarcastically. 'You should have declared that. ' Perfume is not exempt from import duty.'
should have done : 本应该做某事却没有做
shouldn’t have done: 本不应该做某事(但是没有)
You should have arrived here five minutes earlier.
You shouldn’t have told him about it.
exempt 免除的，被免除的
be exempt from 免除
exempt from one's duty/obligation
He is exempt from his obligation
Drinks are not exempt from import duty.
pounce v. To spring or swoop with intent to seize someone or something, To attack suddenly, To seize something swiftly and eagerly 猛扑, 突然袭击以抓住某人或某物, 掌握, 迅速急切地抓某物
Phrase: pounce on / upon sth / sb
eg. The cat pounced on a mouse.
The policemen pounced on the thief and took him to the police station.
A colleague pounced on me because of a mistake in my report.
因我在报告中所犯的一个错误而猛烈攻击我的一个同事
He will pounce on every opportunity to go abroad.抓住机会
