lock filling and emptying opening – Definition, Pronunciation & Pictures

lock filling and emptying opening /ˈlɒk ˈfɪlɪŋ and ˈɛmptiɪŋ ˈəʊpənɪŋ/ n

中文：船闸充泄水孔

Meaning：Holes through which the water flows in to fill the lock-chamber or out to empty it.

Found in these illustrated scenes（1）