An artificial structure or excavation made to resemble a cave or cavern 人工挖开的洞室类似山洞或洞穴的人工建筑或人工洞室
A space station is an artificial structure designed for humans to live in outer space 阅读提示:太空站是在外太空的人造的太空舱,设计适合人类居住,可以用作太空人停留和工作的地方。
A photonic crystal is an artificial structure which has a periodic arrangement of dielectric or metallic materials 光子晶体,即所谓的“光半导体” ,是一种由介质或金属周期排列构成的人工材料。
It ' s believed they slipped on the plastic sheeting used to keep the water in the artificial structure and couldn ' t climb back out 可以相信的,他们是给塑胶的护墙板滑倒,因为惯性跌入人造湖中却爬不上岸