回复：【张宇】20161226宇哥英文26-2

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It's difficult to tell them apart. The kittens look exactly alike-- how can you tell which is which?

讓我們堅持下去吧。感謝宇哥提供的平台與機會。

忍不住晚睡

It's difficult to tell them apart

　　　--世间文字八万个，唯有情字最伤人。

没想到英语也有which is which 这种说法。

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