Return to natural color 回归自然本色
In children, those signs include difficulty breathing; bluish skin color; flu symptoms that begin to improve, then return with fever and worse cough; and fever with a rash.
对儿童来说，这些症状包括呼吸困难；皮肤颜色变青；流感症状开始改善，然后又出现发热和咳嗽加剧；以及伴有皮疹的发热等。
You never know when you might want to return something because your tastes have changed, you have found a defect in the garment or the color is all wrong.
你不知道自己什么时候会因为口味改变、发现衣服上有瑕疵或颜色不对，而想把东西给退了。
A subclass with explicit opacity components should override this method to return a color with the specified alpha.
一个拥有不透明通道的子类需要重写这个方法来返回指定了透明值的颜色对象。
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