你在离开中国之前给我送了那本书，谨写此信以表达我衷心的感谢。
I'm writing to show my sincere appreciation for the book you gave it me before you left China.
当我们把你的观点转变成正确的时候，我们才可能离开，但在那之前不会。
When we've converted you to a proper point of view we may quit, but not before.
你打算在你离开之前举行个欢送会吗？
Do you plan to have a going-away party before you disappear?
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