弦月分为上弦月下弦月这是由于日地月三者位置不断发生变化月相便有盈亏的变化
n. crescent
misc. quarter moon
从新月到上弦月，月亮逐渐圆满起来，它们却忽然消失了。
The moon grew from crescent to gibbous, and suddenly the toads were gone.
早晨和午后，通常是下弦月时，雌性从岩石边下来，来到海岸线。
In the morning and late afternoon around the last quarter of the moon, the egg-laden females descend from the terraces to the shoreline.
这张上弦月照片拍摄于德国斯图加特，世界时二月22日23：45。
This picture of a first quarter Moon was recorded at 23:45 UT on February 22nd from Stuttgart, Germany.
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