"I walk down the street analyzing the force of a boy on skateboard or the recoil of a carpenter using a nail gun, " he wrote.

现在，我走到街头，看见一个男孩玩滑板，或者木匠钉钉子，都会停下来分析他的作用力反作用力。

youdao

This force on the gun will cause a change in momentum for the gun - that's recoil.

施予枪的力将导致枪的动量改变-这就是后座力。

youdao

A powder container, typically cone shaped design to force powder by gravity to feed a gun or transfer system.

一个粉末容器，典型的锥形设计为了使粉末以重力的方式进入喷枪或输送系统。

youdao

That incident has provoked a nationwide debate about gun laws in the US. Vice-President Joe Biden has said his task force on gun control will make its recommendations to President Barack Obama as early as Tuesday.

BBC: Californian teacher talks student out of school shooting

Obama's power and the impassioned pleas of devastated families were no match for the force of gun rights advocates.

NPR: 10 Things To Know For Friday

"We are New Englanders, change doesn't come easy, " said Rep. Craig Miner, the Republican co-chairman of a legislative task force on gun control.

WSJ: Connecticut Parties Split on Guns