;
;We reached a beautiful grotto, whose entrance was almost hiden by the vine.
我们到达了一个美
的洞
,洞的进口几乎被藤蔓遮掩著。
；
，洞We reached a beautiful grotto, whose entrance was almost hiden by the vine.
我们到达了一个美的洞,洞的进口几乎被藤蔓遮掩著。
The particulates have more acidic pollutants with strong acidity and have the corrodibility to grottoes.
细粒子中有较多的酸性污染物并比粗粒子酸性强,这些细粒子对石窟有侵蚀作用。
The development of technology and improvement of test methods are the hopes for solving the periodization of grottoes.
科学技术的发展、科学测定方法的进步和完
，
决石窟分期问题的希望所在。
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