船闸

船闸	chuán zhá	navigation lock
船	chuán	variant of 船
船	chuán	boat / vessel / ship / CL:条,艘,只
闸	zhá	old variant of 闸 / sluice / lock (on waterway)
闸	zhá	sluice; sluice gate / to dam up water / (coll.) brake / (coll.) electric switch