,which 语法but not that porosity is not the same as the permea

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,which 语法
but not that porosity is not the same as the permeability,which measures the ease with which water can flow through a material.能不能讲解一下这句which修饰那个,怎么理解,是什么句式啊?

The proportion of empty space in a rock is known as its porosity. But note that porosity is not the same as permeability, which measures the ease with which water can flow through a material; this depends on the sizes of the individual cavities and the crevices linking them.
空隙在岩石中所占的比率称孔隙率.但要注意孔隙率和渗透性不是同一概念,后者用来测量水流经某材料时的容易度,这取决于单个腔体和连接它们的缝隙的大小.
析：第一个which是关系代词,指代的先行词是permeability, 引导非限制性定语从句（至material), 对permeability进行解释（定义）.而with which 是引导限制性定语从句的介词+关系代词, which指代的是the ease,

注：porosity
The ratio of the volume of all the pores in a material to the volume of the whole.
孔隙率：一材料中孔隙的总体积与整个材料的体积之间的比率
permeability,
1.
The property or condition of being permeable.
渗透,渗透性：可渗透的特质或状态
2.
The rate of flow of a liquid or gas through a porous material.
渗透度,渗透率：液体或气体通过渗透材料流的量度

PS:你的note误打成not,引起理解句意的困难.

,which 语法but not that porosity is not the same as the permea This movie is not the same as that one. but not the same. happiness is not the same as 翻译急 but not that it must be exactly same as the original sa 1.which word is not the same as others?A.pound B.feet C.yard 请问“Not the same as But not the same without the weather in china is not the same as that of australia的同义 You have got the same shirt as I.Yes,mine is _____,but not s This movie is not the same as that one.=This muvie is ______ this flat is not the same as that one because it has a big b