When he fell, his arm knocked the ball into the net.
他倒下时，胳膊刚好把球撞进网。
The task: make the arm reach out to grasp a ball mounted on a board.
测试任务：伸出手去抓板上的那个球。
You'd never throw a ball with your entire arm locked in one place.
你扔球出去的时候不可能使整个手臂固定在一个位置。
His arm is lame from playing ball.
他打过球后一只手臂僵痛。
She limbered up her arm before throwing the ball.
在扔球之前她的手臂做了下准备活动。
It was Toni and I, and the ball ended up hitting my arm.
托尼和我争顶，然后皮球打到了我的手。
For example, before you can throw a ball you must first swing your arm backwards.
例如，在你扔一个球时你必须引手臂到身后。
His arm is lame from playing ball.
他的胳臂因打球而僵痛。
He shot out his arm and grabbed the ball.
他手臂一伸抓住了球。
The arm shaft shaft and hook shaft are supported by ball bearings.
上下轴用滚珠轴承支承，同步齿形带传动。
The arm shaft shaft and hook shaft are supported by ball bearings.
上下轴用滚珠轴承支承，同步齿形带传动。
应用推荐