A sine wave has the same amplitude ( distance from centerline to the top of a peak ) and wavelength ( distance from peak to peak ) over time 一个正弦波有固定的振幅（波峰顶部的高度）和波长（波峰的间距） 。
Swimmers should take care not to reach their arms across the centerline of the body , or they will end up wiggling their way down the lane 请注意胳膊的位置不要超过身体的中线，否则整个游进方向会来回摆动。
Both feet need to be under you at the same time , one in front of the other , with the toes pointing perpendicular to the centerline of the board 两只脚必须同时收到身下，位置一前一后，脚尖的指向与冲浪板的中轴线垂直。
A sine wave has the same amplitude ( distance from centerline to the top of a peak ) and wavelength ( distance from peak to peak ) over time 一个正弦波有相同的振幅（从中心线到上方顶点的距离）和波长（是在一个周期内从顶点到顶点的距离） 。
The swing arms are fastened to the inside structure of the mast , and permit the pipe rack to be low - ered from the stored position to the centerline of the drill string 两个悬臂则固定在支架的内部结构上，并允许管架从贮存位置降到钻柱中线上。
The two drillfloor locations are cantilever fully extended with the drillfloor on centerline and cantilever fully extended with the drillfloor at the maximum transverse location 两个钻台的位置是在中心线上连同钻台完全伸出的悬臂以及在最大的横向位置上连同钻台完全伸出的悬臂。
Owing to the diameters of big and small pulleys are different , while the driving pulley rotates the differential mechanism will not stay at its original place and will make linear movement along the direction of centerline 当主动轮转动时，由于大小差动带轮的直径不同，差动机构就不会停留在原处，而会沿中心线方向上作直线移动。
Stand up on the board , using the uphaul ( the thick rope or webbing which attaches from the front of the boom to the bottom of the mast ) for stability , and put your feet where your knees had been , on either side of the mast and over the centerline 站在滑板上，利用升降索（从桅杆顶端到底端的那根粗绳子或带子）保持平衡，双脚放在刚才膝盖的位置，也就是说桅杆的两边，并越过中心线。
Abstract : it proposes a model for shaft centerline measurement and winding level , gives the coordinates transformation formula of measured data , and develops the program diagram for centerline measurement of wind - shaft 文摘:提出了一种便于微机处理的轴线的空间解析表达方法以及轴线弯曲程度的表示方法，给出了轴线测量数据获取方法与坐标转换公式，提出了零件轴线弯曲时精密测量的一般步骤。
