But controversy remains in the very low success rates in IVF, and in the disputes that can arise over legal paternity between a child's biological and non - biological parents.

但是，由于体外授精技术成功率极低，以及在孩子的生身父母与养父母之间会产生有关合法父亲的争执，所以对此项技术的争议仍然存在。

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He cautions that only 60 babies have been born using this technique so far, and with such low Numbers it is not possible to be certain of success rates.

他指出目前为止只有60个婴儿是利用这项技术出生的，如此少的数量不可能确定成功率的高低。

youdao

For the most part, these were considered a success, with low crime rates and integrated communities. But the isolated towers were not.

总体说来，除了这两栋高楼，这里的建设还算成功，居民关系协调，犯罪率也不高。

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That, in turn, leads to out-of-control costs and low success rates, and actually keeps new projects from starting.

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Typically success rates are low and returns on investment far from assured.

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One idea that has been posited is that we need very low tax rates on entrepreneurial success in order to encourage attempts at such success.

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