Better still, in an SVG editor, you can draw both the areas (an area is a closed path), the open eye and the closed eye, keeping the latter transparent.

更妙的是，在一个SVG编辑器中，可以同时画两个区域(一个区域就是一个封闭路径)：睁眼和闭眼，并让后者透明。

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To delete the background and make it transparent, simply press the delete key to clear the area below the selection.

简单的点击Delete键我们就可以去除背景并把它变透明。

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While you can take advantage of transparency in countless ways, one area that it has helped particularly is with complex backgrounds overlaid with semi-transparent colors.

你可以在很多方面利用半透明的优点，其中之一就是使用半透明的颜色叠加到复杂背景时起到特别作用。

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Instead, he says, it should be on the "middle mile, " the substation and distribution network that is the least transparent area of power delivery.

FORBES: Magazine Article

The technology is transparent, likely with low running costs and wide-area effectiveness, once baseline infrastructure is in place across devices, communications, and trained people.

FORBES: How Virtual Health Assistants Can Reshape Healthcare