更多underdrainage例句

1. I can remember when we had whole fields for skating ponds, but that was before the days of government drains and underdrainage.
2. Underdrainage helps to prevent such ill-effect of continued rains in the early part of a plant's life-time.
3. Almost without fail will he become an earnest advocate of underdrainage.
4. Underdrainage should be permanent in its character, and it is essential that every piece of tile be sound and well-burned.