镰状细胞病的特征是红血球形状发生突变，由平滑的圆圈形状改变为新月形或半月形。
Sickle-cell disease is characterized by a modification in the shape of the red blood cell from a smooth, donut-shape into a crescent or half moon shape.
他们用四个阶段来计算一个周期：新月，半月，满月和半月。
They counted four phases in a cycle: new moon, half moon, full moon and half moon.
这个新月也同样为你找到朋友一同旅游(或者约见朋友)，如果你决定在二月份的下半月任何时候去旅游，你肯定得到很多的乐趣。
This new moon may also find you traveling with friends (or to see friends). If you decide to go anytime during the second half of February, you'd be assured of having fun.
我是在看是新月还是半月？
月亮有四种主要的相：新月、半月、凸月和满月。
The moon has four major phases: crescent, half moon, gibbous and full moon.
月亮有四种主要的相：新月、半月、凸月和满月。
The moon has four major phases: crescent, half moon, gibbous and full moon.
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