... 三口动作筒 three-port actuating cylinder 三腔动作筒 three-volume jack 升降动作筒 elevator actuating cylinder ...
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three-volume jack
三卷本杰克
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Jack has been working in the company for nearly three months which is his probation period, during which he works hard to enhance the sales volume of generators.
杰克已经在公司做了快三个月了，就是说，他的试用期就要结束了。
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