Doubler
n. 倍压器, 倍频器\\n[计] 倍加器
🗣️ 情景例句
that Grandpa Philip bought for him.
祖父Philip给他买的。
What day was yesterday?
昨天是星期几？
Affluent he may be, but he is by no means sure what, to tip the doorman or the chambermaid.
他们可能很富有，但给看门人和房间女服务员多少小费，心中却根本没有数；