| environ. |
cave 1. An underground hollow with access from the ground surface or from the sea, often found in limestone areas and on rocky coastlines. 2. A natural cavity, chamber or recess which leads beneath the surface of the earth, generally in a horizontal or obliquely inclined direction. It may be in the form of a passage or a gallery, its shape depending in part on the joint pattern or structure of the rock and partly on the type of process involved in its excavation. Thus, caves worn by subterranean rivers may be different in character from, and of considerably greater extent than, a sea-cave eroded by marine waves. 3. A natural underground open space, generally with a connection to the surface and large enough for a person to enter. The most common type of cave is formed in a limestone by dissolution (1. 一个可以从地面或从海里进入地下的空洞，通常在石灰石地区和多岩石的海岸线上可以找到。 2. 一个通向地表下方的自然的腔体、腔室或凹室，通常在水平的或倾斜的方向。它的形式可能是一条通路或一条过道。它的形状部分取决于岩石的连接形式或结构，部分取决于挖掘过程的方法。因此，与海洋风浪侵蚀的岩洞相比，地下河流形成的洞穴更加可能有不同的形态。 3. 自然的地下空地，通常和地表有连接允许一个人进入。最普遍的岩洞的类型是石灰石溶解形成的岩洞。) |
