极简线条艺术海报：一棵仙人掌

一张极简线条艺术海报，主题是一棵用简洁黑色线条勾勒的仙人掌，背景为纯绿色。仙人掌造型流畅简化，没有内部肌理或图案，居中摆放以突出主体。整体效果非常干净，没有任何装饰元素，突出仙人掌独特的形状。风格现代，氛围轻松且略带趣味。

AI art prompt English：

A minimalist line art poster with a single cactus, outlined in simple black lines on a solid green background. The cactus is stylized with smooth curves and no inner texture or pattern, placed at the center for emphasis. The overall look is very clean, free of decorative elements, and allows the unique shape of the cactus to stand out. Modern and restful, with a playful touch.