在受精后大约六七个星期时，男性和女性胚胎之间没有什么差别。

For about six or seven weeks after conception, there is no differentiation between male and female.

《柯林斯英汉双解大词典》

不过在许多国家，女性和男性的就业率差别依然巨大且有持续的态势。

But the difference in male and female employment rates in many countries is still large and persistent.

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男性和女性在数学能力上的差别实际上是相当小的。

The differences between men and women in mathematical ability are actually fairly small.

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