keep at arm的意思|示意

Both seem somewhat nervous - he with his left arm crossing his body and fingers slightly rounded in a closed position - and her with her left hand elevated as if to keep harm at bay.

两个人看起来似乎都有些紧张——他将左手微微放到身体前方，手指轻轻地握紧——而她则将左手高高抬起，似乎在控制自己的情绪。

He decided to have his arm set at an Angle so that he could keep playing the guitar.

他决定要在他的手臂的角度设置，以便他能继续弹吉他。

You must keep the left arm absolutely straight and do not move your head at all.

你必须保证左手绝对伸直，并且头一点也不能动。

He also had a tail, but Lucy did not notice this at first because it was neatly caught up over the arm that held the umbrella so as to keep it from trailing in the snow.

他还有一条尾巴，但露茜最初并没有看见。因为怕拖在雪地里搞脏，他把它放在拿伞的那个手臂弯里。