Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.

在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。

youdao

The force is always perpendicular to the direction of motion.

因为这个力总是垂直,于运动的方向。

youdao

The force is always opposing the direction of increasing potential energy, so the force will drive it back and so that's why we call this a stable equilibrium.

力一直和势能，增加的方向，相反，作用力会将其推回，那就是为什么称它，稳定平衡的状态。

youdao

Infinity is the force when we're thinking about it and our brains, negative infinity is when we actually plug it into the equation here, and the reason is the convention that the negative sign is just telling us the direction that the force is coming together instead of pushing apart.

说力有多大时，我们想到的,是无穷大，而方程解出来的,是负无穷，这是因为习惯上,我们用负号表示力的方向,是相互吸引而不是相互排斥的,所以我们可以用库仑定律。

麻省理工公开课 - 化学原理课程节选

They will have the power to hire and fire chief constables and set local police objectives and the budget - but chief constables will remain in charge of the direction and control of the police force.

BBC: Peers reject delay to police chief elections

PPCs will have the power to hire and fire chief constables and set local police objectives and the budget - but chief constables will remain in charge of the direction and control of the police force.

BBC: Police Reform Bill: Consideration of Lords' amendments

These commissioners will have the power to hire and fire chief constables and set local police objectives and the budget - but chief constables will remain in charge of the direction and control of the police force.

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