The author holds that there are not only lots of lownwords but also substrata words in the language.
作者认为撒拉语中不仅有不同来历的借词，还有不同的语言底层。
This happened with such force that heating of the substrata rock occurred and actually caused rock to melt in low laying areas.
这种情形产生的力量使基岩被加热，竟然导致低位区域的岩石融化。
It has become evident in the past few years that the amount of fossil fuel in the earth's substrata is not infinite source of energy.
在最近几年已非常明显的看出在地层里的矿物燃料不是无穷无尽的能源。
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