An ancient man-made near ground surface rock cavern group was found in Longyou County, Zhejiang Province. The 24 large caverns were excavated 2000 years ago.
浙江省西部龙游县的龙游大型古地下洞室群由24个洞室组成，该洞室群开挖于2000年前。
A structure usually refers to any large, man-made object permanently fixed to Earth's surface or in its orbit, as a result of construction.
结构通常指固定于地球表面或绕地球轨道运行的大型人造建筑物体。
For natural, man-made stone craft and refurbishment of the crystal surface, suitable for mining, hotels, Buildings, supermarkets, hospitals, schools and so on.
用于天然，人造石材的晶面工艺与翻新，适用于工矿，宾馆，大厦，超市，医院，学校等。
The repository of removing sensing identifying samples for surface vegetation cover rate is set up by combining man-made investigation with remote sensing identification.
采用人工调查与遥感判读相结合的方法，建立地表植被覆盖度的遥感识别样本知识库。
The primary inducing factors of sand-sliding are surface water, ground water, stream erosion, dynamic load action, wind load action, freezing-and-thawing action, plant and man-made factors.
溜砂的主要诱发因素是地表水、地下水、河流冲刷、动荷载作用、风荷载作用、冻融作用、植物及人为因素。
The primary inducing factors of sand-sliding are surface water, ground water, stream erosion, dynamic load action, wind load action, freezing-and-thawing action, plant and man-made factors.
溜砂的主要诱发因素是地表水、地下水、河流冲刷、动荷载作用、风荷载作用、冻融作用、植物及人为因素。
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