Valve Disadvantages: the valve is prone to leakage around the stem, especially in-board leakage when a vacuum is pulled on the valve outlet.
阀门的缺点：当阀门排气口处是真空时，阀门在阀杆附近容易泄漏，特别是内部泄漏。
One day, people came and pulled up the Flax's stem.
突然有一天，人们来到这里把亚麻的根拔了出来。
The lower stem is physically pulled away from the seat instead of being lifted away by the spring.
下阀杆是被从阀座上物理地推开，而不是被弹簧举起来。
I gently pulled his hand a creeper of the stem, actually still could not pull it off!
我轻轻地用手一拉爬山虎的茎，居然还拉不下来呢！
I gently pulled his hand a creeper of the stem, actually still could not pull it off!
我轻轻地用手一拉爬山虎的茎，居然还拉不下来呢！
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