As recently as 1985, about half of all women in a national survey said they "must have a son." That percentage fell slowly until 1991 and then plummeted to just over 15 percent by 2003.

1985年，全国调查中，有一半的女人说“必须要个儿子”，直到1991年之前，这个比率都下降很慢，但是，到2003年，就猛然下降了超过15%。

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The ventures must be located in Chicago for the duration of the program, but their mission can aim to have national or global reach, according to Jones.

据琼斯所言，为了项目的存续，合资企业不得不建在芝加哥，但是他们的目标是覆盖全国乃至全球范围。

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There's a Costume National jacket that I bought that I must have worn a dozen times now.

我买了一件 Costume National短上衣，现在已经穿了十几次了。

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You also must have a national army and a functional police force that have a sense of national commitment and pride.

CENTERFORSECURITYPOLICY: American weakness on display

Our members must have an airside pass to operate aircraft and now discover that to get that pass they must have a national ID card.

BBC: Manchester launch for ID cards

This personal encouragement from a national figure must have motivated countless enthusiasts to pursue a scientific career.

BBC: Sir Patrick Moore: Chris Lintott's tribute