Definition: a hole or space that something or someone can pass through Level: C2
孩子们从篱笆上的一个开口爬了过去。
The children crawled through an ___opening in the fence.
水被允许通过大坝上的一个开口流出。
The water is allowed to flow through an ___opening in the dam.
探险者们在洞穴墙壁上发现了一个狭窄的开口。
The explorers found a narrow ___opening in the cave wall.
