<svg width="200" height="250" version="1.1" xmlns="http://www.w3.org/2000/svg">
  <!-- 圆形 -->
  <circle cx="25" cy="25" r="20" stroke="red" fill="transparent" stroke-width="5"/>
  <!-- 椭圆形 -->
  <ellipse cx="75" cy="25" rx="20" ry="5" stroke="red" fill="transparent" stroke-width="5"/>
</svg>

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