One cannot keep one's mind on two things at the same time. ; One should concentrate on one's work. ; One's mind can not work on two things together. ; The mind cannot be devoted to two things at one time.
一人不能同时做两件事；心无二用。
No man can do two things at once.
youdao
心无二用，汉语成语，拼音是xīn wú èr yòng，意思是指做事要专心，注意力必须集中，出处汉·桓谭《新论·专学》。
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