Clearly, there has to be a force at the pin.

很明显的，在钉子这里有一个力。

youdao

If there were no force at the pin, g this object would be accelerated down with acceleration g, and that's not what's going to happen.

如果没有力的话，这个物体就会以加速度,往下掉，但是这,并没有发生。

youdao

The method can calculate the contact force and its change range between the pin gear and the cycloid during the whole transmission more precisely.

该方法可以比较精确地计算在整个传递过程中针齿和摆线轮齿面接触力的大小和变化范围。

youdao

Earlier the court heard Mr Reeve had been punched, stamped on and cut with a knife in an alleged attempt to force him to disclose his PIN.

BBC: Barry Reeve murder trial: Woman 'confessed to killing'