收缩期血压是血压读数的最高值，并且是心脏收缩时血液泵出力量的测量值。

Systolic blood pressure is the top number of a blood pressure reading and is a measurement of the force of blood pumped out when the heart muscle contracts.

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经过试验和探索，找到了夏季真空波动的原因，在直接空冷机组中，真空泵出力对真空的变化有明显的影响。

Through tests and exploration, the cause of vacuum fluctuation in summer was found, in the direct air cooling unit, the output of vacuum pump had obvious influence on the variation of vacuum.

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