这是因为月球环绕地球的轨道是卵形的或者椭圆形的。
This is because of the Moon's orbit around Earth which is oval or elliptical in shape.
符头可以是黑色的(圆形或卵形)或白色的，用在五线谱上以表明音高。符头的形状在历史上有很多种，比如在单音歌颂中。
Noteheads may be black (a circular or oval shape filled in) or white and are used on the staff to indicate pitch. The shape of noteheads has differed historically, as in plainchant.
花朵较大，花瓣基部愈合可达3毫米，宽卵形，花瓣圆形有短尖，5—8毫米长。
Flowers large, petals basally connate for 3 mm, broadly ovate, rounded with a short mucro, to 5-8 mm.
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