Five , six years . And this is like a checkup for us . Um , achance to poke around the engine maybe chang the oil , replace a seal or two . Yeah .

约翰 ·史密斯：五、六年了，这对我们算是一次检查，看看引擎状况，换个油，换一两个零件。

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According to industry standards: mute oil free compressor mute value must be about 50 dB, no oil as 100% no oil, no water standard should be accurate to 0.001 um.

根据行业标准：静音无油空压机静音值必须达50db左右，无油为100%无油，无水标准需精确到0.001 um。

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