金属是不透明的，所以甚至最薄的金属板也能像一面石头记墙那样能够阻隔光。
Metals are opaque so that even the thinnest plate can keep out the light as well as a stone wall.
阳像线划原图和注记必须是不透明的。
像之前一样重复操作，但使用尖的形状的不透明面板如下图所示。这次不透明面板如图所示。
Do the same thing as before, but use a pointy shape like below as the mask. This time the opacity mask will look like the image below.
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