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这里面一定是有原因的。 I can't understand why he did it. (我不明白他为什么那么做。) There must be reasons for it. (这里面一定是有原因的。) 这里的must指“一定”。 He must have his reasons. There must be logic behind it. logic “根据”。 我不知道你为什么要这么做。 I don't see why you're doing this. (我不知道你为什么要这么做。) Because it's the right thing to do. (因为这样做是对的。) 这里的see指“理解”、 “明白”。 Why are you doing this? (你为什么这么做?) I don't understand why you're doing this. 我想知道原因。 I want to know the reason. (我想知道原因。) Why do you want to know? (你为什么想知道?) 有什么不理解或是想知道理由、原因的时候可以这么说。 I want to know why. What's the reason? I'd like to know. 这个手册太复杂了。 This manual is too complicated. (这个手册太复杂了。) Let's go ahead and simplify it. (我们就来把它简化一下吧。) be complicated “复杂”。 | 
