However, under the combined influence of the natural and human factors, a great number of important outdoor immovable stone monuments, including the Yungang Grottoes, are suffering from severe weathering damage, which is obviously irreversible. 在自然和人为因素共同作用下,包括云冈石窟在内的一系列重要的室外不可移动石质文物,正遭受着严重的风化破坏,加强对石质文物的保护成为一项迫在眉睫、长期而艰巨的任务。
Meanwhile, the velocities of P-wave and S-wave gained by PS-wave logging from soil and severe, middling and mild weathering strata may take very important role in weathering demarcation for Rayleigh wave and refraction wave explorations. 同时,由PS测井所得到的土层及强、中、弱风化层的纵横波速还可对面波和折射波勘探中风化层位的划分起标定作用。