No man can do two things at once
... There is no know-it-all世上没有万事通 A man cannot whistle and drink at the same time一心不可二用 No garden without its weeds yard没有不长草的院子 ...
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一心没有二用，你不可能同时做好两件事情。
You can't do more than one thing at a time or manage the benefit of both.
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