它的初始不透明度是0，即完全透明。
Its initial opacity will be zero, which is fully transparent.
如果你没有申报的透明度，这将是完全不透明。
If you do not declare the transparency, it will be fully opaque.
背景可能被设置在任何东西的不透明和透明之间。
The background can be set to anything between opaque and transparent.
背景可能被设置在任何东西的不透明和透明之间。
The background can be set to anything between opaque and transparent.
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