Polygon overlay is a spatial operation in which a first thematic layer containing polygons is superimposed onto another to form a new thematic layer with new polygon.

多边形叠合是一种空间操作，在第一个包含多边形的主题层中叠上另一个由多边形组成的主题层。

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Polygon overlay is spatial operation in which a first thematic layer containing polygons is superimposed onto another to form a new thematic layer with new polygons.

几何图形叠盖是包含几何图形的第一主题图层被叠加形成新主题图层以新的几何图形的空间操作。

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The leachate circulation is a method to treat the garbage leachate, using the purification action of the superimposed soil layer and the garbage dump layer of the filling ground.

渗滤液循环是利用填埋场的上覆土壤层及垃圾填埋层的净化作用来处理垃圾渗滤液。

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And much to my delight, I discovered that I was able to see the city's past as well as its present: the London of my imagination superimposed upon the reality, a transparent city in which the old was encased in the new like an ancient layer cake wrapped in glistening sandwich-wrap.

WSJ: Alan Bradley on Writing About an England He'd Never Seen | Traveler's Tale