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and pull it off in one quick, pain-free motion：瞬间扯下来,完全无痛

"Grasp the linen strip by its tab...|抓住突出的布条 | ...and pull it off in one quick, pain-free motion."|瞬间扯下来,完全无痛 | Was it not "pain-free"?|这不是无痛的吗?

mean free path of phonons：声子平均自由径

电子平均自由径 mean free path of electrons | 声子平均自由径 mean free path of phonons | 平均频率 mean frequency

free trade pacts：自由貿易恊定

free trade pact 自由貿易協定 | free trade pacts 自由貿易恊定 | freelance journalist 自由記者

wood free paper：道林纸

wove finish paper 布纹纸 | wood-free paper 道林纸 | wood-free 不含磨木浆的纸张

water-free：不含水的

water-free well无水油井 | water-free不含水的 | water-gas condenser水煤气冷凝器

water-free：无水的

water well drill;水井钻井装置 | water-free;无水的 | water-free fuel;无水燃油

water-free oil：不含水原油

water-free all-silica fiber 全硅无水纤维 | water-free oil 不含水原油 | water-gas generator 水煤气发生器

water-free recovery：无水采收率

无枪身射孔器||retrievable wire perforator | 无水采收率||water-free recovery | 无水采油期||water-free oil production period

water-free fuel：无水燃油

water-free;无水的 | water-free fuel;无水燃油 | water-to-air system;水-气系统

water-free all-silica fiber：全硅无水纤维

water-flooding pump for oil field 油田注水泵 | water-free all-silica fiber 全硅无水纤维 | water-free oil 不含水原油

uniovular twin：真孪生

uncompetitative inhibition 非竞争性抑制 | uniovular twin 真孪生 | unit membrane 单位膜

play off one against the other：挑拨离间, 从中得利

play off (难分胜负的)延长赛 使出丑 嘲弄 以...冒充 假装有病 | play off one against the other 挑拨离间, 从中得利 | play off one against another 挑拨离间, 从中得利