As the sun sinks over the horizon, animateColor is used to change the sky's color, and the moon and the stars fade in by animating their opacity.
随着太阳落下地平线，使用animateColor来改变天空的颜色，通过变化月亮和星星的不透明性使它们渐渐显现出来。
The KenBurnsFader class handles the fade-in and fade-out of the image using opacity.
kenburnsfader类使用不透明度处理图像的淡入淡出。
Select Soft Brush tool, set its opacity 20% and size to 30px. Paint a fade dot in the center of the cross.
选择柔角笔刷工具，不透明度为20%，大小30像素，在十字中部画一个虚幻的园点。
The quick drying, oil-based paint withstands indoor and outdoor conditions. The marks remain true and will not fade, chip or lose opacity.
其快乾之油性颜料不受户内外环境影响且标记仍保留原状不会褪减，缺损或失真。
The quick drying, oil-based paint withstands indoor and outdoor conditions. The marks remain true and will not fade, chip or lose opacity.
其快乾之油性颜料不受户内外环境影响且标记仍保留原状不会褪减，缺损或失真。
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