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Don't let me down.

以前教过大家I'm counting on you. 和I'm depending on you.(我全靠你)，都是在有求于人时非常用得着的恭维话，今天多教一句：Don't let me down.(不要让我失望)，别人听到你这么说可能会更加为你尽力去办。Let down是‘令人失望’，例如朋友问你How was the movie?(那出电影如何呢?)，如果说：It was a big let down. 就是说‘它太令人失望’的意思。

对话

A: How's tomorrow's business presentation going?

B: Our preparation work is almost done. We'll have a rehearsal tonight after dinner.

A: Well, I'll look forward to hearing some good results. Don't let me down.

B: I'll try my best to clinch the deal.

甲：明天的业务发表会怎样?

乙：筹备工作已差不多完成，我们在今晚晚饭后会进行彩排。

甲：好的，我期待听到好消息，不要令我失望。

乙：我会尽力去取得合同。

为了宣传公司的产品、服务，公司职员往往要去其它机构或公开场所示范、讲解等，　这英文叫做presentation，例如：The fund house made a presentation of the new investment funds they were launching.(基金公司举行讲座，介绍新创办的投资基金)。

现在，某乙要为公司争取合同，示范、讲解当然要准备周详。他老板说：Don't let me down.(别使我失望)。Let down　除了解作‘辜负(某人)期望’，还可解作‘使丢脸’或‘破坏(声誉)’，例如：Your misconduct has let down the name of the bank.(你违反职业操守，破坏了银行的声誉)。

Let someone down的反义词是live up to someone's expectations.(不负某人所望)。 某乙的老板其实可以说：I'm sure you'll live up to my expectations.(我相信你会不负我所望)。这有鼓励的意思，比忧心忡忡的一句Don't let me down. 似乎好一点。Don't let me down. 会加重某乙精神上的压力，对他示范、讲解的表现未必有好处。

所以，你是某乙的同事，发觉他赴会前精神紧张，就应该设法消除他的焦虑，例如你可以说：You don't need to worry. I'm sure everything will go well as you're well prepared. You'll make a big hit.(你不必担心。你准备得那么好，相信一切都会很顺利。你会赢得观众赞赏)。Make a hit. 是‘博得好评’、‘大获成功’的意思。