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1·Don't speak for your friend; speak for yourself.

不要再为人说项了，谈谈你自己的看法吧。《新英汉大辞典》

2·Hey, speak for yourself here.

说你自己吧，别捎上我。

3·Let your work speak for yourself.

让你的作品为你发声。

4·Speak for yourself.

代表你自己说话。

5·Speak for yourself. I think I played quite well.

你只能说你自己，我觉得我表现得很不错。

6·Do not speak for your friend, speak for yourself.

不要代表你的朋友发言了，谈谈你自己的看法吧。

7·Speak for yourself, but I think you're totally wrong.

我不同意你的看法，但我认为你完全错了。

8·Well, speak for yourself. I doubt if that is true of most Brits.

但这只是为自己说话而已，我怀疑是否大多数英国人会认同这样的说法。

9·Why don't you speak for yourself, John? (Henry Wadsworth Longfellow).

“你为什么不替自己说话呢，约翰？”(亨利·华兹华斯·朗费罗)。

10·Trust yourself. Think for yourself. Act for yourself. Speak for yourself. Be yourself.

相信自己，为自己思考，为自己行动，为自己说话，做自己。