intermittent positive pressure breathing

例句：

1. 1.The patient's condition improved intermittently over the next few days.
   病人在接下来的几天里断断续续地好转。
2. 2. Therain was intermittently heavyand light.
   雨时而大时而小。
3. 3. Theteam practiced intermittentlyduring the off-season.
   球队在休赛期断断续续地进行训练。