| 单词 | underdrain |
| 释义 | Word Frequency underdrainnoun (ˈʌndəˌdreɪn) 1. a drain buried below agricultural land verb (ˌʌndəˈdreɪn) 2. to bury such drains below (agricultural land) Derived forms underdrainage (ˈunderˌdrainage) noun |
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