确认画笔的不透明度为100%。

Make sure the opacity on the brush is at 100%.

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当你已经选择了画笔工具，按下数字键可以调整画笔的不透明度。

When you have the brush tool selected, pressing the number keys will adjust the brush opacity.

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另外，为了达到非常好的效果，降低了画笔的不透明度为20%。

Also, to achieve a really nice effect, decrease the Opacity of the brush to 20%.

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