1800, "that which tranquilizes;" from 1824 as "a sedative" (first reference is to ground ivy), agent noun from tranquilize; in reference to one of a large group of anti-anxiety drugs, it is recorded by 1956.
实用例句
1. If a tranquilizer is prescribed, be sure your physician informs you of its possible side effects, such as addiction.
如果开了镇静剂，一定要让医生告诉你它可能带来的副作用，例如上瘾。
来自辞典例句
2. Laughter is a tranquilizer with no side effects.
笑声是一种没有副作用的镇静剂。
来自辞典例句
3. And the red ones are tranquilizer and blood - splatter darts.
红色的是镇定剂和血液缓流飞镖.
来自电影对白
4. You're a premature mid - life crisis. You need a tranquilizer.
你提前进入 中年 危机, 你需要吃镇定剂.
来自互联网
5. Probably, therefore, some substance in the tranquilizer inhibits fertility.