He fell, striking his head on the edge of the table.
他摔倒了，头碰在桌棱上。
It is important not to let production levels fall.
重要的是别让产量滑落。
The results of the survey fell into two distinct groups.
调查结果分为截然不同的.两组。
Students over 25 fall into a different category.
25岁以上的学生属另一类。
There is still a risk that the whole deal will fall through.
整桩买卖化为泡影的风险仍然存在。