8k超清简约风格插画，主体为一个成年女性身体的轮廓

8k ultra-clear minimalist style illustration, the main body is the outline of an adult female body, without head and arms, wearing underwear, horizontal lines and dot markings at the waist, arrows pointing to the waist on both sides, and a solid light blue background, the overall visual effect is concise and clear, conveying information that focuses on waist lines or waist measurement. The main colors are black and light blue, with exquisite details

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