upstroke

Be sure to ventilate on the upstroke.

要明確吹氣是在手抬起時吹入的.

辭典例句

During the course upstroke, the membrane potential attains zero, and an electrical gradient no longer exists.

在升支發(fā)展過程中, 膜電位一達到零, 電位梯度即不再存在.

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