receptive spot
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圆圆是在二月份人工受精怀上的，因为这对国宝对对方没有展示出一点兴趣。动物专家称它们只是太年青了，而且没有经验。
Yuan Yuan was artificially inseminated in February, because the panda pair showed a disappointing lack of interest in each other. Zoologists believe they are simply too young and inexperienced.
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