内层细胞形成扁圆形的胚胎盘，拍胎盘将会发育成胎儿。
The inner cells form a flattened circular shape called the embryonic disk, which will develop into a baby.
这种生物头上伸出带刺的肢体，扁圆形的嘴巴就像照相机的光圈一样开开合合。
But the fossil creatures had spiny limbs sprouting from their heads and circular, plated mouths, which opened and closed like the diaphragm of a camera.
泰坦的扁圆形也可以帮助解释为什么它的甲烷湖集中在极地附近。
Titan's oblateness may also help explain why its methane lakes are concentrated near the poles.
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