The upshot is that if the rider leans forward he travels forward, whereas if he leans backward the machine will stop and then go into reverse.
结果就是如果驾驶者向前倾斜身体它就向前行驶，可是如果他向后倾斜机器就会停止然后向相反方向行进。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop.
这个问题也就产生了，因为天文学家已经发现有些行星在天空似乎停止，向后移动，然后在一个循环。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop. Others appeared brighter at times and less bright at others.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动，而其他行星看上去有时亮些，有时又不怎么亮。
Come to a complete stop. Do not let your vehicle roll forward or backward.
首先要完全停车，车辆不能向前或前后滑动。
Once fairly started on the way to the great knowledge, to doubt is to risk insanity; to come to a dead stop is to fall; to recede is to tumble backward, headlong into an abyss.
一旦诚实地走上通往伟大知识的道路，怀疑就是去冒精神错乱的危险，停滞就会跌落，后退就会摔倒，迅速地坠入深渊。
The rotary table top can mechanically or manually rotate, can rotate forward and backward freely, rotate and stop automatically, and can accelerate or decelerate or even stop rotating.
该旋转台面可机动或手动旋转，可任意正、反旋转、自动停停走走，加速或减速甚至停止旋转。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and go forward in a loop.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and go forward in a loop.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动。
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