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left handed coordinate system：左旋坐标系,左手坐标系

left-hand zero | 左边零 | left-handed coordinate system | 左旋坐标系,左手坐标系 | left-handed nut | 左旋螺母

left handed crystal：左旋水晶

left hand rule 左手定则 | left handed crystal 左旋水晶 | left handed quartz 左旋水晶

left handed worm：左旋螺杆

left hand two speed sliding door 左开门 | left handed worm 左旋螺杆 | left lay 左捻(绳股)

left handed quartz：左旋水晶

left handed crystal 左旋水晶 | left handed quartz 左旋水晶 | left handed system 左手系

left handed quartz：左旋石英

left-handed nut | 左旋螺母 | left-handed quartz | 左旋石英 | left-handed rotation | 左向旋转

left handed quartz：左旋石英,左旋水晶

left-handed mirror iamge 左旋反射镜像 | left-handed quartz 左旋石英,左旋水晶 | left-handed system 左旋系统

left handed quartz：左旋石英 (水晶)

左旋偏振 left-handed polarization | 左旋石英 (水晶) left-handed quartz | 左手参考系 left-handed reference frame

left hereditary ring：左遗传环

左旋曲线 left handed curve | 左遗传环 left hereditary ring | 左同伦逆元 left homotopy inverse

left ideal：左理想

左同伦逆元 left homotopy inverse | 左理想 left ideal | 左幺元 left identity element

left indent：左端缩进

left hand 左手 | left indent 左端缩进 | left parenthesis 左括号

orchitis,chronic：睾丸炎,慢性

睾丸炎,急性 orchitis,acute | 睾丸炎,慢性 orchitis,chronic | 睾丸炎,腮腺炎性 mumps orchitis

central fixation point：中心注视点

central file on-line ==> 中心文件联机,主文件联机 | central fixation point ==> 中心注视点 | central force ==> 中心力