| 单词 | side drain |
| 释义 | > as lemmasside drain side drain n. ΚΠ 1740 G. Nelson Wonders Nature 68 The Aquæducts and Side-drains..preserve them [sc. roads] from the Injuries of violent Rains. 1971 N. Hudson Soil Conservation xiii. 239 For roads on gentle gradients open side drains are required only on the upper side. < as lemmas |
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