单个点源污染的环境损害成本估算是本文的核心。

Calculating the environmental damage cost of a single point source is the core of this paper.

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在创建一个点shapefile时，若系统提示添加一个多线形状，那么就以单个点添加每个顶点。

While creating a point shapefile, when you are prompted to add a polyline shape, add each vertex as an individual point.

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当计算机的某个部分必须被直接控制时，如监视器上的单个点或者流向打印机的单个字符，这时也使用汇编语言。

Assembly languages are also used when some part of the computer has to be controlled directly, such as individual dots on a monitor or the flow of individual characters to a printer.

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