顶上羽毛折光之故?后两张的顶上绿毛变成了蓝毛。曾经有几次拍绿头鸭和绿眼鸭时,观察到这折光变色的现像。
顶上羽毛折光之故?后两张的顶上绿毛变成了蓝毛。曾经有几次拍绿头鸭和绿眼鸭时,观察到这折光变色的现像。
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