tranquillizer

例句：

1. 1. The patient was given a tranquilizer to help him relax.
   给病人开了镇静剂以帮助他放松。
2. 2.The tranquilizer helped the patient to sleep better.
   镇静剂帮助病人睡得更好。
3. 3.The tranquilizer was effective in treating anxiety disorders.
   镇静剂在治疗焦虑障碍方面是有效的。