纵摇对横摇的非线性影响除以上参数外，还与漂心的纵向位置有关。
The nonlinear effects of heave on ship roll are also dependent on the longitudinal center of floatation besides above factors.
而在不同纵向位置，这些同心环的强度分布是不同的，且是周期性变化的。
However in different longitudinal position, the intensity distribution of these rings is different and varies periodically.
三脚架头还提供了身体与头部的照相机或安装在任何需要的头部像身体纵向位置固定附件。
The tripod head is further provided on the head body with a fixing attachment for mounting a camera or the like in any desired lengthwise position on the head body.
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