Underdrain
n. 阴沟, 地下沟道, 盲沟, 暗渠
🗣️ 情景例句
Is there anyone else in your life?
在你生活中还有其他人吗
A guilty conscience needs no accuser.
贼胆心虚。
The pictures it sent us were very disappointing because its main mirror was faulty!
它传送给我们的图像很令人失望，因为它的主要镜子有误差。