V one permit should never be valid more than of one working shift.

一个动火证只适用一个班次的作业，最多一天有效。

youdao

Use of smaller valves or V-Port trim with lower flow capacity may permit the valve to be open at a greater percentage, thus avoiding damage.

采用具有更小流量的通径更小的截止阀或V形阀内件截止阀，可能使得阀门能够具有更大的开启度，因此可以避免损坏。

youdao

V. office to get my driver's permit. Some of my friends already had their licenses, so I figured it was time.

当时朋友中有很多已经有驾照了，所以我觉得也是时候了。

youdao

Two studies showed ways in which anti-H.I.V.drugs could permit infected women to breastfeed their newborns with less risk of passing the virus to them.

VOA: special.2009.07.29