根据世界卫生组织的定义，一对夫妇12个月以上未采取任何避孕措施，性生活正常却未孕，就属于不孕不育。女性称为“不孕症”，男性称为“不育症”。
按照规划，科研团队将开展更长周期的小鼠空间科学实验，模拟人类在轨驻留半年以上的生活，研究小鼠的生理响应与空间适应性。
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is debatable, although historical accounts generally do. They are certainly of a
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Older power stations have simply placed a grill across the inlet pipes, filtering out fish, which are killed in the process.