Some are transparent, others are opaque.
有些是透明的，有些是浑浊的。
A value of 1.0 is completely opaque and a value of 0.0 is transparent.
值1.0完全不透明，值0.0则为透明。
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.
背景可能被设置在任何东西的不透明和透明之间。
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