If there is a leak, have an auto mechanic replace any problematic gaskets or oil seals.
如果发动机漏油，则让一个汽车技工更换掉所有有问题的垫圈和盖子。
The gear pump seals the selection principle is not high demand, for the occasion, but by experience, not to replace timely selection.
齿轮泵密封垫的选用原则是，对于要求不高的场合，可凭经验选取，不合适时再更换。
When returning cylinders to the supplier, properly close the cylinder valve, replace and secure any valve outlet seals, and properly install the cylinder cap.
钢瓶返还给供应商时，正确关闭钢瓶阀门，替换并固定阀门排气口密封，正确安装钢瓶帽。
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