A standard letter was sent to all candidates.

给所有求职者均寄去了一封标准函。

《牛津词典》

Then if there is a positive reaction they write down the topic on a standard letter sized piece of paper.

倘若有积极的响应，他们可以在一张信纸规格大小的纸上写下此话题。

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The specialty is engaged in produces the fastener, the stainless steel standard letter, each kind of non-sign screw, hardware pressing part.

专业从事生产紧固件，不锈钢标准件，各类非标螺丝，五金冲压件。

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Those are the two biggest rating agencies in the U.S. today and they're extremely powerful organizations because they --Standard & Poor's also does letter grades, a slightly different system, but almost the same.

如今他们是美国最大的两家评级机构,而且他们是非常权威的组织,标准普尔也进行字母评级,体系上有些区别,但基本相同

耶鲁公开课 - 金融市场课程节选

And UK standard letter stamps will be 10% cheaper at 45p instead of 50p.

BBC: Jersey Post stamps cheaper for Christmas

From Saturday until 10 December, customers can buy local standard letter stamps for 35p instead of 37p, a 5.4% saving.

BBC: Jersey Post stamps cheaper for Christmas

To travel undetected in the guise of a standard business letter, the device needed to fit into the most commonly used envelope (a number ten in America, which is about 100mm by 240mm).

ECONOMIST: Monitor