Underdrain
n. 阴沟, 地下沟道, 盲沟, 暗渠
🗣️ 情景例句
No. Please endorse the check at the back.
不会的。请在支票的背面签名。
He that once deceives is ever suspected.
骗人一次，受疑一世。
All produets have to go through five checks in the whole process.
所有产品在整个生产过程中得通过五道质量检查关。