lock filling and emptying system
/ˈlɒk ˈfɪlɪŋ and ˈɛmptiɪŋ ˈsɪstəm/
n
English · lock filling and emptying system中文 · 船闸充泄水系统Español · sistema de esclusas de vaciado y llenadoFrançais · système de remplissage et de vidange
意味：System consisting of a conduit with sluices alongside the side wall and perpendicular conduits on the canal bed that together raise and lower the water level in the lock.