Prefading
预调节
🗣️ 情景例句
There are abundant free materials available on the internet.
因特网上有丰富的免费资料提供。
I know the boy whose father is an attorney.
我知道那个男孩的父亲是律师。
This morning, however, a firemen accidentally discovered the cause.
然而今天上午，一个消防队员偶然发现了起火的原因。