tranquillizer [ ˈtræŋkwɪˌlaɪzɚ]

例句:

• Use as in pharmacy industry synthetic tranquillizer and anaesthetic.
  在制药工业中用作合成镇静剂和麻醉剂.
  
• Sex is safest tranquillizer in the world.
  性爱是世界上最安全的镇定剂.
  
• The patient is verry worried, so the doctor gives him a shot of tranquillizer.
  由于病人烦躁不安, 医生为他打了一针镇静剂.