1. Infrequent oases in the desert. 
   沙漠中鲜有的绿洲
2. Explosions, though infrequent, are an occupational hazard for coal-miners. 
   矿井爆炸虽然不常发生，但却是煤矿工人职业中的危险。
3. have difficult or incomplete or infrequent evacuation of the bowels. 
   排便困难、不完全或者稀少。
4. Difficult, incomplete, or infrequent evacuation of dry, hardened feces from the bowels. 
   便秘有困难的、不完全的或不经常从肠道排泄干燥且硬的大便
5. And the infrequent and indiscriminate use of the Chinese language also forms a vicious circle. 
   少用与乱用互为因果，循环相生。

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• 1. 稀有类型
  infrequent pulse 迟脉...infrequent types 稀有类型...infression 膨胀形衰退
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