探洞 meaning in English

exploratory heading
trial heading

Haroun tazieff , the polish scientist , has spent his lifetime studying active volcanoes and deep caves in all parts of the world
波兰科学家哈罗恩?塔捷耶夫花了毕生的精力来研究世界各地的活火山和探洞。
Other sports activities are mountaineering , hiking , canyoning , speleology , mountain - biking , archery , climbing , rappel on rock and on bridge , skiing on stones , kayak and rafting on rivers of the surrounding area
其他体育运动有在周围地区的登山、远足、峡谷穿越、探洞、山地骑行、射箭、攀岩和速降（在山岩或桥上）、滑石、划艇和漂流。
The region belong to high geostress area . in the preceding excavation of 4km long exploratory tunnel , several bigger flows had taken place . the maximal flux approached 4 . 91m3 / s and the maximal water pressure is 10 . 22mpa
在前期4km长探洞施工过程中，曾发生多次较大涌水，单点最大涌水量达4 . 91m ~ 3 s ，长探洞封堵后最大水压力达10 . 22mpa ，工程区高外水压力问题突出。