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2013-05-23 12:21
求翻译：The fi rst observation that the motility of human spermatozoa could be preserved after freezing and thawing was made by Lazzaro Spallanzani in 1776. In the middle of the nineteenth century the idea arose to establish a sperm bank for cattle breeding. Around the same time the possibility of freezing soldiers’ semen befo是什么意思？ 待解决
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The fi rst observation that the motility of human spermatozoa could be preserved after freezing and thawing was made by Lazzaro Spallanzani in 1776. In the middle of the nineteenth century the idea arose to establish a sperm bank for cattle breeding. Around the same time the possibility of freezing soldiers’ semen befo
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