单语范例（未经PONS编辑处理）
英语
- The oestrous cycle of ringtail possum lasts 28 days.en.wikipedia.org
- They found that the oestrous cycle was more stimulated by scent than normal mice, and that the ovaries mediated the olfactory signals independently of the nose.www.independent.co.uk
- These animals do not reproduce well in captivity, due to the difficulty of handling musth bulls and limited understanding of female oestrous cycles.en.wikipedia.org
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