I'm going to put you in various positions and then ask you what is the direction of gravity.

我会把你放置在不同的情境中，然后问你重力的方向。

youdao

The movement of the calcium crystals sends a signal to the brain to tell us the direction of gravity. This is not the only cue the brain receives.

钙晶体的运动向大脑发出信号使我们感知地球引力的方向，但这不是大脑接收到的惟一信号。

youdao

However, the semicircular canals that the researchers stimulated to control walking and balance detect rotational movements of the head, not the direction of gravity.

然而研究人员通过刺激可以控制行走和平衡的半规管却是检测头部的转动而不是重力的方向。

youdao

For most of us, gravity acts this way, defines a vertical direction very naturally and the blackboard is oriented this way, so very natural to call that x and call that y and line up our axes.

对我们多数人来说,重力作用下,很自然地确定了竖直方向,而我们的黑板又是这个指向的,所以很自然地定出 x 轴和 y 轴,并标出我们的坐标系

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