... underside词组短语 piston underside活塞下侧 flat underside平底板 ...
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piston underside pumping 活塞下部泵作用
piston underside pump 活塞下侧泵
piston underside pump scavenging 活塞下侧泵扫气
underside of piston crown 活塞顶内侧
underside of the piston head 活塞头下部
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