Question

希望能有老师帮我分析下这个英语句子的语法结构。谢谢先

They shall be covered by a transparent sheet of mechanical strength comparable to that of the enclosure.

Answer 1

They shall be covered by strength，这是精简结构，被动语态

它们被显而易见覆盖了一大片机械力量
sheet n.一大片（覆盖物）a sheet of strength，transparent 修饰a sheet of，mechanical修饰strength

comparable to that of the enclosure定语，修饰strength
comparable to比得上

Answer 2

They 是主语
shall be covered是谓语
后面整个是介词短语 作状语
by是介词
后面整个是介词宾语
a是冠词 transparent是形容词 修饰 sheet，sheet是介词宾语
of mechanical strength是介词短语 修饰sheet。
后面是形容词短语 作后置定语修饰 strength。
comparable to that of the enclosure.

追问

comparable to that of the enclosure 这里的that 可以换成which吗？

追答

不能 这里的that是指示代词 代替前面提到的不可数名词strength