例句與造句

1. A total of 16 healthy subjects underwent bronchoscopy with bronchial mucosal biopsies and bronchoalveolar lavage ( bal ) on two occasions , in random order : once at 14 h after a 2 - h exposure to air pollution in a busy road tunnel , and once after a control day with subjects exposed to urban air during normal activities
   對16名健康受試者在隨機順序下限后進行兩種處理，分別為暴露于某繁忙的公路隧道的污染空氣2小時，和選擇某一天暴露于一般繁忙程度的城市大氣中作為對照， 14小時后進行支氣管鏡下支氣管粘膜活檢和支氣管肺泡灌洗（ bal ） 。
2. It's difficult to find control day in a sentence. 用control day造句挺難的