That AA batteries are standardized makes them more readily accessible, helps drive down their price through competition and economies of scale, and thus makes the AA battery more valuable.

比如说双a电池的标准化使得它更容易被买到，而且竞争和规模效应使得产品价格下降，从而使得双a电池的效用更高。

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The rating agency also lowered its rating on Portugal, to a -; a day later it downgraded Spain from AA + to AA.

标准普尔也降低了葡萄牙的评级到A -；一天后它再次把西班牙的评级从AA +降低到AA。

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I always log into AA last and purchase from the AA window to ensure I'll receive my miles.

我常常在最后登录AA，然后从AA窗口购物以确定我收到奖励的里程数目。

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Then, if you weren't quite Aaa, you were Aa and if you weren't quite Aa, you were A and then you could become Ba.

于是,如果你达不到AAA,你就会是AA,如果你达不到AA,你就会是A,再往下就有可能是BA

耶鲁公开课 - 金融市场课程节选

This has become the official mantra in many ways of the AA movement: "God, grant me the serenity to accept the things I cannot change; the courage to change the things I can change; " and wisdom to know the difference."

它已成为AA运动的正式圣言：,“主啊，请赐我安详，接纳我不能改变的事物;,请赐我勇气，去改变我可以改变的东西;,并赐我智慧去认识这两者的差别“

哈佛公开课 - 幸福课课程节选

He could only say aa aa aa, no more than that for some moment.

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The AA's Mr King said "76% of AA members are cutting back on journeys, household expenditure or both, due to the high cost of fuel".

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"Effective October 7, American will operate all JFK flights from the AA terminals with AA airplanes, " said Chairman Bob Baker in a statement to TWA employees.

CNN: TWA to shut JFK airport terminal