这是因为早期胚胎存在着两套原始生殖管道，沃夫 氏管 ( Wolffian )和缨勒 氏管 (wii1lerian)。当沃夫 氏管 发育时，就形成了雄性的生殖管道，而缨勒 氏管 发育时则形成雌性生殖管。
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获得其内部的传热传质情况对文氏管的设计和运行管理具有非常重要的指导意义。
To obtain the state of heat and mass transfer inside Venturi tube is very helpful to guide design and management of Venturi tube.
针对双文氏管湿法除尘系统一级文氏管喉口存在的问题，开发设计了矩形定径式喉口。
Based on the problems existed in Venturi tube throat of double Venturi tube wet cleaning system, the rectangle sizing throat is developed and designed.
以女性含有的抗苗勒氏管激素的多少，科学家运用一个数学模型来估计女性将进入绝经期的时间。
Based on the amount of AMH women had, scientists used a mathematical model to estimate when women would go into menopause.
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