Precoated
(precoat 的过去时) (在过滤器表面涂敷的)滤料层
🗣️ 情景例句
How's Donald?
Donald怎么样？
Draw water with a sieve.
竹篮子打水一场空。
from which can be seen the strata the drill has been cutting through.
从中能看出钻头所钻透的地层。