The unique relief valve construction incorporates two channels: one for air, one for water. When the relief valve opens, as in the accompanying air-in/water-out diagram, the right-hand channel admits air to the top of the reduced pressure zone, relieving the zone vacuum. The channel on the left then drains the zone to atmosphere. Therefore, if both check valves foul, and simultaneous negative supply and positive backpressure develops, the relief valve uses the air-in/water-out principle to stop potential backflow.
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One day for fresh air 在一个空气新鲜的日子
The unique relief valve construction incorporates two channels: one for air, one for water.
独特的安全阀结构，具有两个渠道：一个用于空气，一个用于水。
"One of the risk factors for premature deaths is the air we breathe, over which individuals have little control," he said.
他说：“导致人们过早死亡的一个风险因素就是我们吸入的空气，而这是个人几乎无法控制的。”
Once cans are clean, let them air-dry for at least one hour before opening or storing them.
等罐子干净了，在贮藏或开启他们之前让他们风干至少一个小时。
For every increase of five degrees Celsius in air temperature, the patients had a seven and one-half percent higher risk of migraine.
VOA: special.2009.03.18
The United States halted air travel for three days after the terrorist attacks in two thousand one.
VOA: special.2010.04.23
Let sanitized cans air-dry for at least one hour before opening or storing them.
VOA: special.2010.07.19
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