This paper consists of three sections, in the first section, the history of Rayleigh waves is introduced in detail and some problems unsolved are pointed out.
本论文包括三部分：第一部分详细介绍了瑞雷波的研究历史，并指出了存在的问题。
The essence of human beings is an unsolved sphinx riddle haunting the thinkers and philosophers throughout the history of mankind.
人的本质问题是古今中外的思想家、哲学家求之不解的斯芬克斯之谜。
The essence of human beings is an unsolved sphinx riddle haunting the thinkers and philosophers throughout the history of mankind.
人的本质问题是古今中外的思想家、哲学家求之不解的斯芬克斯之谜。
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