一项由比利时科学家发表新的研究报告建议，超过90%的试管授精卵会发生严重的染色体反常。

A new study reported by Belgian scientists suggests that there are severe chromosome abnormalities found in over 90% of eggs fertilized for in vitro treatments.

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最好的证据水平（比利时），对应的最佳证据确凿的发现，伴随着等级的建议。

The best evidence level (BEL), corresponding to the best conclusive evidence found, accompanies the recommendation grade.

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