这是一个概率问题，但用微分方程解决，故称概率微分模型。
This is a probability problem, called it probability differential model because it's solved by differential equation.
多囊卵巢综合征患者的卵巢有很多小囊泡发育，故称‘多’囊。
In patients with PCOS, multiple small cysts develop in the ovaries, hence the term "poly" cystic.
牛习惯夜间吃草，农家常在深夜起来挑灯喂牛，故称“丑牛”。 。
The ox is used to eating grass at night and farmers often get up in the midnight and feed them, so we have chou, ox.
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