按螺纹朝外方向将公螺母装入电线。装入前螺母应被检查过没有刮伤，毛刺。

After ensuring the male coupling nut is free of scratches, nicks and burr, take the nut and insert into the cable with the thread pointing outward.

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实验结果表明DLAP单晶和LAP单晶具有相同的对称性。 氘化使晶体的通光范围向红外方向扩展。

The experimental results confirms that the symmetry of DLAP is the same as that of LAP and deuterium broadens the region of transparent.

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马体围绕骑手的内方脚轻微弯曲，马的外方肢从内方肢前面交叉越过，马体牠朝行进的方向弯曲。

The horse is slightly bent around the inside leg of the rider. The horse's outside legs pass and cross in front of the inside legs. The horse is bent in the direction in which he is moving.

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It's good to have a vector pointing in the radial direction of length one.

所以引入这么一个模长为 1,方向沿圆心向外辐射的矢量作用很大

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This equation is telling you if you compress it, namely if x is negative, F will be then positive, because it's pushing you outwards.

这个方程告诉我们,如果压缩弹簧,即令 x 为负,F 就为正,因为推力的方向向外

耶鲁公开课 - 基础物理课程节选

er is a vector at each point of length one pointing radially away from the center.

r 是一个模长恒为 1 的矢量,方向沿半径向外

耶鲁公开课 - 基础物理课程节选