When he fell, his arm knocked the ball into the net.

他倒下时，胳膊刚好把球撞进网。

youdao

Award a penalty kick: there is no such thing as' ball to arm 'in this situation: the player must take the consequences of his actions.

判罚点球。这不是一个所谓的“球打手”的状况，所以这名后卫只能对他自己的行为自食其果。

youdao

It will place both arms on a table to maintain its balance when trying to sit down in a chair, or use one arm for support when taking a big swinging kick at a ball.

它坐在椅子时会把双手扶住桌子以保持自己平衡，或用力踢一个球时会用一个手扶住物体来支承。

youdao

On a slow pitch, Rayner then got going by bowling Michael Lumb as he played back before he had John Crawley taken at slip, nibbling at his arm ball.

BBC: Hampshire stung by Rayner's spin

He gives every delivery a serious tweak, but has a superb arm ball, perfectly illustrated by the sliders that dismissed Ricky Ponting and Xavier Doherty - he is a brilliant spin bowler.

BBC: Jonathan Agnew column

Botha was pinned by Rayner's arm ball.

BBC: Joyce ton comes to Sussex rescue