大剖面 meaning in Chinese

heavy gauge

4 ) through making maps of cave section correlation in the pleokast topography of the early hercynian movement , three karstic circle are recognized in tahe oilfield , and each circle were produced one cave layer , the top cave are earlier than the down caves
4 )通过海西早期古地貌条件下的四条洞穴对比的大剖面的制作，认为区内普遍发育三个岩溶旋回，并相应产生三套洞穴层，上部洞穴先形成。