So the sum of all forces is zero, and there is no torque.

所有力之和为，没有力矩。

youdao

For an object to be in static equilibrium, it is not enough that the sum of all forces is zero.

处于静力平衡的物体，仅仅所有作用力之和，为0是不够的。

youdao

And so the net, the sum of all forces on that object there is no net force on that wheel but there is a net torque, and that's why it's going to precess.

所以综合，物体受的所有力，车轮不会受到净力，但是有一个，净作用力，那就是我要推进的。

youdao

The goal is to withdraw all combat troops by next September, but leave thousands of troops to train Iraqi forces.

VOA: special.2009.10.10

So all signs of a cosmic battle, or some primordial act of violence between the forces of chaos And evil and the forces of cosmos and good are eliminated.

因此所有宇宙间战争的标志，或者原始的暴行,在混乱邪恶与宇庙美好力量之间的冲突都被消泯。

耶鲁公开课 - 旧约导论课程节选

The short answer is that I think these writers best represent all the different threads, all the different forces in the American Novel Since 1945.

简单的回答是我觉得这些作家极洽当地,代表了1945年以来美国小说中的，各种主题和力量。

耶鲁公开课 - 1945年后的美国小说课程节选

"We're going to make sure all forces know we have this technology, " Cash said.

CNN: Preparing for peace

Allen also called for all forces to undergo quick training on the proper way to handle Islamic religious books.

WSJ: U.S. Pulls Out Advisers After Two Killed in Kabul

The home secretary pledged to raise the standard of all forces towards those at the higher end of the scale.

BBC: Straw targets burglars