circulation pattern的用法和樣例：
例句
- Hot-air circulation or comman type.
采用熱風(fēng)循環(huán)型或普通型。 - The city gleans and collects scraps people contribute to development of circulation type city society, while they also bring a series of social problems of city administration.
城市拾荒者在為循環(huán)型城市社會(huì )的發(fā)展做出貢獻的同時(shí)，也給城市管理帶來(lái)了一系列的社會(huì )問(wèn)題。
