digging foundation pit的用法和樣例：
例句
- Dewatering is always necessary in foundation pit excavation and hand dig piles.
基坑開挖或施行人工挖孔樁常常需要進行人工降水。 - Diaphragm walls are commonly used as retaining structures in many deep foundation pits, especially when the environment protection is severer.
摘要地下連續牆剛度大，變形小，作為基坑開挖階段的圍護結構可有效的保護周邊環境。
