加速度计是靠感测因惯性力引起的相对位移来测量视加速度的，不能测量真实的重力加速度。
The principle of accelerometer is based on the measurement of the relative displacement that arises between the elastically suspended proof mass and the accelerometer frame subject to acceleration.
偏移划桨的优点，在于它可以随便视情况而做立即的调整，例如在一个陡峭的海壁时，最好的方式是将划船的重力集中在一边做最大幅度的划动，另一边则是相反以维持行进时的方向。
One great advantage of unfeathered paddles is that they are more versatile. The paddle float, which is otherwise a must for ocean paddling, can be left at home with a little practice.
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