One instance of simple harmonic motion is that of the projection on any diametre of a point which describes a circular path with uniform angular velocity . 当一质点以匀角速度作圆周运动时，则它在任意直径上的投影的运动便是简谐运动的一例。
As the perspective closed the distance between them, the dutchman's legs twittered like a pinioned insect's, but this was an illusion; he was not caught . 投影把两人的距离缩短了，那个荷兰人的两腿就象昆虫被人捏住翅膀那样颤抖起来。然而这只是错觉，因为他并没有被人抓住。
This rotation can be simplified by plotting the positions of the principal sections and principal axis on a stereographic net as described by jessop and wells from the rotations recorded . 按照杰索普和威尔士所论述的方法，根据记录下来的转动角，把主截面和主轴的位置画到一个极射赤平投影网上，可使上述过程简化。
One 10 x 15 portable screen or built - in screen 一部10x15手提投影幕或内置投影幕
Fast algorithm of image matching by projection 基于投影特征的图像匹配的快速算法
Shift between perspective shade and axonometvic shade 轴测投影与透视投影的互换
Generalized inverse of matrix and orthogonal projection 矩阵的广义逆与正交投影
Large screen and full color laser projection technology 大屏幕全彩色激光投影技术
Three - pass 3 - d pre - stack migration by radon projection 三步法三维叠前拉东投影偏移
General specification for step and repeat exposure systems 分步投影曝光机通用规范
