在0.5处设一黑色色标，渐变会默认认为从起点到色标之间都是黑色。
Assigning the black color at position 0.5 automatically makes the gradient, from the start to this stop, black.
锦鲤黑色色斑是由于黑色素存在时，其他各色素组分的颜色被黑色所掩盖；
The pigment components of different breeds of brocaded carp were mainly apricot or orange pigment.
店员盯着他和他那顶褪了色的黑色女帽看了一会儿，然后笑了起来。
The clerk stared at him and the rusty black bonnet a moment, and then laughed.
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