In marsupials, such as opossum and kangaroo, the life span of the corpus luteum is similar in pregnant and nonpregnant females.

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。

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So far, they've found that just as in rats, pregnant women perform worse on some learning and memory tasks than nonpregnant controls.

到目前位置，他们发现，就和大鼠一样，和没有怀孕的对照组相比，怀孕的女性在某些学习和记忆任务中的表象更糟。

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But on behavioral measures, rat moms perform significantly better on spatial working memory tests than nonpregnant rats, with first-time moms performing the best of all.

但是在行为测量的维度，产仔的大鼠在空间工作记忆测试中的表现明显好过没有怀孕的老鼠，而第一次产仔的大鼠表现最好。

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But on behavioral measures, rat moms perform significantly better on spatial working memory tests than nonpregnant rats, with first-time moms performing the best of all.

但是在行为测量的维度，产仔的大鼠在空间工作记忆测试中的表现明显好过没有怀孕的老鼠，而第一次产仔的大鼠表现最好。

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