词汇	oil retainer
释义	oil retainer 护油圈,润滑油保持环
随便看	artificial pasture Artificial Patent family artificial pearl Artificial pearl-breading artificial penile nodule Artificial Penis artificial perception artificial perfume artificial perfusate artificial periosteum artificial permafrost table artificial permanent embolism artificial persimmon frost artificial perspiration artificial perturbation artificial petroleum artificial petroleum industry artificial phalangeal joints artificial pH gradient artificial photosynthesis artificial physics artificial physiognomy artificial pigment artificial pile hole formation artificial pine forest