efficiency relatively low
efficiency relatively low
效率较低
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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And, although the authors report relatively low efficiency so far, in the context of someone who does not have any banked sperm to fall back on, these odds are probably very encouraging to make this kind of approach worthwhile.
BBC: Stem cell op may 'restore sperm'