美铃：中国有一句谚语：一心不能二用。

M. L. : There's a Chinese proverb: The mind cannot be in two places at once.

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一个人不能同时又吹口哨又喝酒；一心不能二用。

A man cannot whistle and drink at the same time.

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一个人不能同时又吹口哨又喝水，一心不能二用。

Man cannot whistle and drink at same time.

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在早上，有一同事，需要我的帮忙。一心不能二用。

This morning, there is a colleague needs my help, as one can not be dual-use.

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在早上，有一同事，需要我的帮忙。一心不能二用。

This morning, there is a colleague needs my help, as one can not be dual-use.

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