Underdrainage
n. 暗渠排水, 地下排水
🗣️ 情景例句
How can I reward your help?
我怎样才能报答你的帮助呢？
Lily is a Sophomore now.
莉莉现在大学二年级。
Later, we ate our picnic under some trees.
后来，我们在树下吃野餐。