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He had spotted a tiny bottle at the bottom of my case and he pounced on it with delight.
with delight 欣喜若狂地 （with和抽象名词搭配, 表示内心充满了一种感情）
-- with confidence 自信地 -- with care 细心地
-- with pride 骄傲地 / -- with delight 欣喜若狂地
pounce on 向...猛扑过去, 对...大做文章
-- The policeman pounced on the thief. 警察向小偷猛扑过去。
-- Don't pounce on my mistake. 不要对我的错误大做文章。
'Perfume, eh?' he asked sarcastically. 'You should have declared that. Perfume is not exempt
from import duty.'
should have和过去分词搭配（表示本应该做某事却没有做, 具有谴责性的味道）
-- You should have arrived here five minutes earlier.
-- You should have told me about it.
shouldn't have done 本不应该做某事
exempt v.免除 adj.被免除的（be exempt from）
-- Drinks are not exempt from import duty. Perfume is not exempt from import duty either.
As I expected, he did not believe me.
As：关系代词（引导非限制性定语从句, 它所指代的内容就是主句的整个句子的含义）
-- As we know, the earth is round. 众所周知, 地球是圆的。
-- As I mentioned 正如我所提及的
-- As I soon learned, he was English himself. 正如我很快得知的,他也是英国人。
关系代词as和which的区别：
as所引导的非限制性定语从句, 可用在主句之前。
which引导的非限制性定语从句, 只能用在主句之后。
