1) the natural cave
天然洞穴
1.
However,it is then more seldom seen in the earth sandstone that the natural cave is discovered;the natural cave that is discovered in the change flow stand of the Right bank of Yangtse gorges during the investigating and measuring results in many inconvenienceon to the Investigation and Construction.
但在泥质砂岩中发现天然洞穴则比较少见,在建设三峡右岸换流站时就发现了泥质砂岩中的天然洞穴,给勘探、施工造成了许多不便。
2) physical speleology
天然洞穴学
3) natural caves
自然洞穴
1.
On characteristics,development and utilization of Chongqing's natural caves
重庆自然洞穴的特色与开发利用
4) natural cave
天然洞体
1.
The Instability of natural cave is absolute and its stability is relative.
天然洞体不稳定是绝对的 ,稳定是相对的。
6) caves
[英][keiv] [美][kev]
洞穴
1.
Study of Database Construction of Karst Caves in China;
中国岩溶洞穴数据库建设研究
2.
High-frequency seismic prospecting used to find caves in the rock-mass below stakes;
桩位下浅层基岩内洞穴的高频震波勘探研究
3.
When it was being drilled,a vertical well was drilled at first,and caves were made in coalbed gas sect,then a horizontal well were drilled at a distance of 200 m,horizontal segment were in connection with the caves,and 10 branch holes were lateral drilled symmetrically in horizontal sect.
钻进时,先钻一口直井并在煤层段造洞穴,在距200 m处钻一口水平井,水平段连通洞穴,再在水平段上对称侧钻出10个分支井眼。
补充资料：石油天然气国际贸易(见石油市场与天然气市场)
石油天然气国际贸易(见石油市场与天然气市场)
石油天然气国际贸易(internotional tradeof011 and只as)见石油市场与天然气市场。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条