If I keep the pressure constant.
当我保持压强恒定。
As long as you keep the pressure constant.
只要压强是恒定的。
Vents, usually at the wing tips or tail, keep the pressure constant.
通气孔通常在翼尖或尾部,这些通气孔可以保持压力恒定。
If I keep the pressure constant.
当我保持压强恒定。
On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.
另一方面,温度,体积和压强,在实验室中比较容易保持恒定。
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