ellipsoidal grating

例句：

1. 1. The elliptical orbit of the planet is uniquely shaped.
   行星的椭圆形轨道形状独特。
2. 2. The elliptical shape of the galaxy makes it difficult to see clearly.
   星系的椭圆形状使得它难以清晰看见。
3. 3. The elliptical galaxies are often found in clusters of stars.
   椭圆星系通常存在于恒星群中。