The school rules state that no student shall be allowed out at lunchtime unless he has a request form.

学校规定说不允许学生中午外出，除非他有外出申请表。

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Its defenders point out that global rules will not be adopted unless they are first agreed upon by national watchdogs.

但是拥护它的人指出全球规则总是不被采纳除非他们是首次被国家的监管部同意。

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To reduce execution time, unless the rules are columnar, you should use virtual tables where possible, and avoid using sampling.

要减少执行时间，除非规则是柱状的，否则，在可能的情况下采用虚拟表，并避免使用抽样。

youdao

But there would be no protecting British savers, whose pensions would be damaged by the Brussels rules, wherever the Pru ends up - unless those rules are reformed before implementation in 2014.

BBC: Pru's fears for British investment

Rules are pointless unless they have some practical effect in constraining governments.

ECONOMIST: Britain's public finances

Turkey kicked out Israel's ambassador, and still rules out reconciliation unless Israel apologises for the deaths and pays compensation to the victims' families.

ECONOMIST: Tests mount up for Turkey��s newly assertive foreign policy