If you don*t ( ) (提示：know the meaning of ) me ,i*ll say it again.

If you don*t ( ) (提示：know the meaning of ) me ,i*ll say it again.
If you don*t ( ) (提示：know the meaning of ) me ,i*ll say it again.

If you don*t ( ) (提示：know the meaning of ) me ,i*ll say it again.
understand （理解）
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understand/ follow 懂得，理解