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.
萼裂片宽卵形到近圆形。
叶片通常长圆形到卵形，心形的或近如此在基部；叶和果没有短柔毛。
Leaf blade usually oblong to ovate, cordate or nearly so at base; leaf and fruit without pubescence.
理想的眼睛是小、卵形，而不是圆形、深褐色、在头部的位置是正向前方。
Eyes the ideal eyes are small, oval rather than round, dark brown, and placed forward on the head.
聚合果长10 - 12厘米，穗状；蓇葖长圆形、倒卵形或卵形，顶端圆钝或具短凸尖。
Fruit an aggregate, spicate, 10-12 cm long; follicles long ellipsoid, obovoid or ovoid, apex obtuse or abruptly mucronate.
北美东部产的一种普通水生植物，飘浮叶长圆形至倒卵形，基部常具缺刻，花白色，有黄斑点。
Common aquatic plant of eastern North America having floating and submerged leaves and white yellow-spotted flowers.
无距萼片披针形；上部萼片狭卵形或长圆形。
这种乔木高7米，果实呈卵形或椭圆形，烤制后芳香异常，脆如花生米，食…
This kind of arbor is 7 meters tall, fructification submits egg form or elliptic, bake the scent after making unusual, fragile be like pignut, feed.
叶倒卵形或倒卵状长椭圆形。
倒卵形至倒卵状椭圆形，稀为倒卵状长圆形，长6至12厘米，阔2.5至5厘米。
Obovate to obovate-elliptic, very rarely obovate-oblong, 6-12 cm x 2.5-5 cm.
倒卵形至倒卵状椭圆形，稀为倒卵状长圆形，长6至12厘米，阔2.5至5厘米。
Obovate to obovate-elliptic, very rarely obovate-oblong, 6-12 cm x 2.5-5 cm.
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