内置减压阀，防止因外来强压或强风状态下闭门而造成的主机损坏或漏油。
Built-in relieve value, prevent damaging the main unit and oil leakage caused by shutting the door by strong pressure or wind.
内置减压阀，避免因外来强压或强风形态下闭门而成造地弹簧保护或漏油。
Built-in pressure relief valve to protect the unit against any abuse from strong pressure or strong wind when closing the door.
当卷层云受到飞机或强风的干扰时，水滴会立即冻结或蒸发，若为蒸发就会形成孔洞。
When cirrostratus clouds are disturbed by planes or strong winds, the droplets can freeze instantly or evaporate, the latter of which will form the hole.
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