He saw a helicopter fly over and the people inside yelled ov

and的前后各是一句话
yelled是yell的过去式
yell
vi. 大叫,叫喊
n. 喊声,叫声
vt. 喊叫着说
His yell of anger could be heard in the next room.
隔壁房间都听得见他生气的叫喊声.
It helps if you can conquer your shyness and yell out English crazily .
如果你能够克服你的羞涩,疯狂大喊英语,将会对你有好处.
She had seen him smash his hat and yell with fury when he had missed his aim.
每逢他没有击中目标,她总看到他一边甩帽子一边大声怒骂.