The development of technology and improvement of test methods are the hopes for solving the periodization of grottoes.
科学技术发展、科学测定方法进步和完善,是解决期题所在。
The development of technology and improvement of test methods are the hopes for solving the periodization of grottoes.
科学技术发展、科学测定方法进步和完善,是解决期题所在。
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