前第四纪 meaning in Chinese

pre-quaternary

On this basis , it also studies the main recharge of groundwater , discusses the relationships between river and groundwater , shallow confined water and phreatic water , northern karst water and quaternary phreatic water as well , and get the recharge percentage which river recharges to phreatic water
在此基础上，研究了地下水的补给来源，探讨了河水与地下水、浅层承压水与潜水、北部岩溶水与山前第四纪潜水之间的相互关系，确定了河水对潜水的补给比例。
It is indicated that the karsts denudation surface in the mount lu and that of southern shandong province are the same denudation surface . based on the relation between the level of cave and denudation surface , the hilltop on the north of mount tai is also the denudation surface formed in the same period
在前第四纪地貌面研究中，根据莱芜平州顶上发现的白彦砾岩，确认以平州顶?仰天槽为代表的仰平期(中新世至上新世)岩溶剥夷面与鲁南地区白彦砾岩代表的古地面属同一期古剥夷面。