Что думаешь? Оцени!
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，更多细节参见新收录的资料
Global news & analysis。新收录的资料是该领域的重要参考
You can look a little further afield for more direct evidence of the long-term efficacy of freezing for fertility preservation. There are some neat animal studies in which sperm frozen for 50 years was used to create sheep, with the authors noting that the pregnancy rate of the frozen semen was identical to the pregnancy rate for the fresh semen.