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- 假设ab 线与XY 线相等。Let the line AB be equal to the line XY.
- 假设AB线与XY线相等。Let the line AB be equal to the line XY.
- 在线in-line
- 把电源接头线与摄像机相连并把其插入墙上的电源插座Connect the power adapter cable to the camera and into a wall outlet.
- 在线的on-line
- 设AB线与CD线相交点为E。Let the point where AB cuts CD be called E.
- 零线zero curve
- 米线rice stick
- 流线streamline
- 轮廓线contour line
- （天球的）回归线代表太阳经过的最北视界线与最南视界线的两条相应的天球纬线Either of two corresponding parallels of celestial latitude that are the limits of the apparent northern and southern passages of the sun.
- 标线gage mark
- 剥线钳decrustation pliers
- 在线支付pay online
- 摆线cycloid
- 线工lineman
- 终点线finish line
- 扎线tieline
- 白线linea alba
- 包络线envelope line
