Underdrain
n. 阴沟, 地下沟道, 盲沟, 暗渠
🗣️ 情景例句
Please sit down, Alexandra.
请坐 Alexandra。
Is the production line fully attomatic?
生产线是全自动的吗？
Is there much of a price difference.
价钱有很大的差别吗？