公兽和母兽是很容易区分的，因为公兽长着像鬃毛一样的肉钉。
They are easily distinguished since the males have fleshy spikes emerging from their manes.
在有袋目动物中，如负鼠和袋鼠，妊娠和非妊娠母兽的黄体存在时间相似。
In marsupials, such as opossum and kangaroo, the life span of the corpus luteum is similar in pregnant and nonpregnant females.
医师们决定，如果母老虎可以充做另一头母兽所产下的幼兽的代理母亲的话。
The doctors decided that if the tigress could surrogate another mother's cubs.
医师们决定，如果母老虎可以充做另一头母兽所产下的幼兽的代理母亲的话，或许就能有所改善。
The doctors decided that if the tigress could surrogate another mother's cubs, perhaps she would improve.
医师们决定，如果母老虎可以充做另一头母兽所产下的幼兽的代理母亲的话，或许就能有所改善。
The doctors decided that if the tigress could surrogate another mother's cubs, perhaps she would improve.
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