A. evaporation B. water cycle C. complicated process D.
ever-going-on process E. rainfall F. ground water G. vapor H.
transpiration I. high land J. formation of clouds K. formation of
rain L. cold air M. drops of rain N. absorbed by soil O. porous rock
layer P. non-porous rock layer Q. accumulation of water R. process of
water cycle 不渗水岩层( ) 冷空气( )