- 拗口
- hard to pronounce
- 拗口
- awkward-sounding
- 刀口
- edge of a knife
- 刀口
- crucial point
- 刀口
- right spot
- 把劲儿用在刀口上
- bring efforts to bear on the right spot
- 插口
- socket
- 插口
- jack
- 插口
- outlet
- 隘口
- (mountain) pass
- 操作
- operate
- 操作
- manipulate
- 手工操作
- manual operation