洞内
4.COMPARATIVE RESEARCH ON MOLLUSCA,ARTHROPODA AND CHORDATA COMMUNITIES IN XIA CAVE,FEILONG CAVE AND BAILONG CAVE IN XINGYI
6.Control Measurement and Hole-Through Survey within Parallel Adit of No. Ⅱ Line in Qinling Extra-Long Tunnel
9.Owing to slow recessing and long travel distance of the UHF radio waves, this system can transmit the images in tunnel and implement active talk.
10.We made a hole in a cork and pushed into it a narrow glass tube. Then we pushed this into the neck of a bottle which we had filled with coloured water.

