There are usually lots of small fish at the water-gate.
闸口往往会聚集许多小鱼。
2
When the gate is raised, the water can flow freely.
闸门提起时水就可以畅流。
《牛津词典》
3
The distribution of stress of structures of watergate under conditions of different support restraints is analyzed and some advices are given to improve the design and construction.