To achieve the purpose of storing industry solid wastes and enhancing subgrade stability in a seasonally frozen region, Structure III, which utilized modified silty clay and extruded polystyrene board as a novel subgrade thermal insulation layer , was presented.
上段的Structure III, silty clay ，NSTIL我在后面书写过程中多次用到，不了解前面需不需要加the，如下段：
In terms of the thermal insulation capability, the numerical simulation of coupling moisture and temperature was applied to analyze that of the Structure I, II and III. The research results show that both of the modified SC and NSTIL have the advantage of good thermal insulation property, but thermal insulation property of the NSTIL is greater than that of the modified SC.
请老师帮忙指出上述的the的用法有问题吗？能提点建议更好了!
网友提问的几个问题，都涉及定冠词。
网友这类专有名词（也是非常强的专业术语），加不加定冠词，原则是：
1. 单个的专有名词，不加冠词，即：零冠词。
2. 由几个普通名词（包含单个的专有名词在内）构成的专有名词，原则要加定冠词。即使是缩写，也要加定冠词。请依据这个原则处置即可。
举例说明：
中国： China
中华人民共和国：thePeoples Republic of China
