Suppose someone gave you a pen - a sealed, solid-colored pen. You couldn't see how much ink it had.
假设有人给了你一枝笔，一枝密封的、纯色的水笔，里面有多少墨水你看不到。
Materials: rapidograph, silver gel pen, water color pencil, colored ink, paper.
媒材：针笔、银色中性笔、代针笔、水性彩色铅笔、彩色墨水。纸。
Materials: rapidograph, silver gel pen, water color pencil, colored ink, paper.
媒材：针笔、银色中性笔、代针笔、水性彩色铅笔、彩色墨水。纸。
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