Precoated
(precoat 的过去时) (在过滤器表面涂敷的)滤料层
🗣️ 情景例句
Then you retired.
然后你退休了。
I will happily admit that I am as nervous as a cat on a hot roof.
我承认现在我非常紧张，像热锅上的蚂蚁一样。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）