因此，这一形状就有了一个名称，即像犄角一样的月亮外形。
The shape thus took its name from this horned appearance of the moon.
为什么月亮的形状会有规律地变化？
改变位置和形状，月亮是他们较容易观察。
The changing position and shape of the moon was easier for them to observe.
改变位置和形状，月亮是他们较容易观察。
The changing position and shape of the moon was easier for them to observe.
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