drainage
noun [ U ] uk/ˈdreɪ.nɪdʒ/ us/ˈdreɪ.nɪdʒ/
排水系统;排污系统
the system of water or waste liquids flowing away from somewhere into the ground or down pipes
drainage channels/ditches/systems 排水渠／沟／系统
土壤排水能力
the ability of soil to allow water to flow away
These plants need a sunny spot with good drainage. 这些植物需要种植在阳光充足的地方，土壤排水能力要强。