例句： your studies will suffer if you play too much football. 如果你总是踢足球，你的学业就会受到影响。
under the cover of... 在……的掩护下；以……为借口
例句： the troop 1 safely under the cover of darkness. 军队在夜幕的掩护下安全撤离了。
i'll pick up the tab. 我来付帐。
对话： a: do we have to pay the transportation fee? b: no. this trip is on me. you don't have to spend a penny. i'll pick up the tab. a: how generous you are.
a：我们得付交通费吗？ b：不，这次旅行我请客。你们不用花一分钱。我来付费。 a：你真慷慨。
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v.取[收]回( withdraw的过去式 )；（使）撤退[出]；提；收回
参考例句：
she withdrew to confer with her advisers before announcing a decision. 她先去请教顾问然后再宣布决定。 来自《简明英汉词典》
she quickly withdrew her hand from the hot iron. 她很快地将手从火烫的熨斗上缩了回来。 来自《简明英汉词典》
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