一些英语语法问题.nec2里的.in his proposed

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一些英语语法问题.nec2里的.in his proposed
how would passing trains solve the problem of ventilation in his proposed double railway-tunnel?
请问下各位老师.in his proposed 是什么语法?his 后面不是加名词 proposal吗?或者动词前面用he.但是前面又有介词in ...

proposed是形容词,修饰后面的名词railway-tunnel
in his proposed double railway-tunnel 介词短语做状语
his proposed double 都是用来修饰后面的名词railway-tunnel多个形容词或限定词共同修饰一个名词