| 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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