梦见头发掉光了一大片:at arm's length如何翻译？

at arm's length如何翻译？ En: arm's length是什么意思？ "an arm's length transaction"是什么意思? 请教hold one's arm 是什么意思啊？ pluck at one's bcard 是什么? at the network's edge turn up one's nose at at one's desire 是什么意思？ 如何用at 命令 take a shot at one's career 如何翻译？