fell是什么意思

　　He fell, striking his head on the edge of the table.

　　他摔倒了，頭碰在桌棱上。

　　It is important not to let production levels fall.

　　重要的是別讓產量滑落。

　　The results of the survey fell into two distinct groups.

　　調查結果分為截然不同的兩組。

　　Students over 25 fall into a different category.

　　25歲以上的學生屬另一類。

　　There is still a risk that the whole deal will fall through.

　　整樁買賣化為泡影的風險仍然存在。