1. trouble （作动词）
trouble 作为动词的两个意思：1. worry or upset 2.inconvenience 麻烦某人 sorry to trouble you / trouble sb with sth
Never trouble trouble till trouble troubles you .
造句：There is one thing that ‘s been troubling me—what should I do if I failed the exam ？So I have to trouble you to give me some advice. (注advice不可数)
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