To get a feel for what this would mean, bear in mind that the amount of oxygen in a given volume of air changes with atmospheric pressure, and the local pressure changes with the weather.
要了解这将意味着什么？给定体积的空气中的含氧量是随着大气压变化而变化的，而当地的气压又是随天气变化的。
The existing standard for LABS at UBC is 10 air changes per hour.
UBC实验室目前的标准是每小时换气10次。
There shall be 10 air changes per hour of ventilation in wet laboratories and 8 air changes per hour of ventilation in dry laboratories.
化学实验室空气换风量至少为10次每小时，仪器室至少为8次每小时。
There shall be 10 air changes per hour of ventilation in wet laboratories and 8 air changes per hour of ventilation in dry laboratories.
化学实验室空气换风量至少为10次每小时，仪器室至少为8次每小时。
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