at arm rs length的用法和樣例：
例句
- The length of an arm is not much.
一臂之遙不算太遠呀。 - An arrow stood out from a tree trunk beside him, quivering gradually back into visibility less than an arm's length from his head.
一枝箭，插上了他旁邊的一棵樹(shù)上，箭身的抖動(dòng)漸漸平息，他可以清楚地看到，這把箭離他的頭，不到一臂之遠。 - He fended off a jab at his chest.
他避開(kāi)了當胸一擊。 - We avoided the enemy's main forces and struck at his weak spots.
我們避開(kāi)敵人主力，打擊他們的弱點(diǎn)。
