油管路、主机回油过滤器易堵塞；
The oil pipeline, the main engine oil discharge filter easy to stop up;
压缩机并联技术的关键在于解决回油分配问题。
The key technology on compressor parallel is to maintain the safe oil levels.
单孔式回油，模具采用高碳钨合金钢不易破损。
Punch dies made of high carbon tungsten steel and not easy to wear off.
带停机防回油。
皮鞋一般在鞋底回油软垫，可以支撑脚掌的拱形部位。
Mike: They even have special insoles to support the arches of my feet.
非法加工者再将地沟油回卖给餐厅。
Illegal processors may then sell the oil back to restaurants.
非法加工者再将地沟油回卖给餐厅。
Illegal processors may then sell the oil back to restaurants.
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