- 
                                        
knock the bottom out of
使突然坍塌
 
- 
                                        
Pads which bottom out, should not have spring pockets.
最底的垫板,不需要弹簧保护装置。
 - 
                                        
It will bottom out at some point.
在某时它会降到最低点。
 - 
                                        
Knock the bottom out of this box, please.
请将这箱子的底打下来。
 - 
                                        
She knocked the bottom out of our argument.
他把我的论点直劈得体无完肤。
 - 
                                        
The way a person is difficult to bottom out.
一个人的路,难以走出低谷。