勾线是一个美术术语，指的是将模型上存在的粗槽和细槽轻轻抹去或填补的方法。
布制手袋会有被勾线的可能。
所以有必要对天花板进行适当的勾线和进行吊顶处理。
Therefore, it is necessary for proper ceiling and ceiling hook line processing.
按我们的理解是，点子、花朵和另瓣的颜色均应换成白色，而叶脉和花朵的勾线(或轮廓线)仍保持原来的黑色。
To our understanding, colours of the spots, flowers and leaves are to be changed into white, while the veins and the Outlines of flowers will remain black as they are.
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