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One way is to stop a stream of urine, mid-flow.
一种办法是在小便的时候停止，再尿。
youdao
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The flow of energy between the grid and electric cars need not be one-way.
电网和电动车之间的电流不一定是单向的。
youdao
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The flow of energy between the grid and electric cars need not be one-way.
电网和电动车之间的电流不一定是单向的。
youdao