Education (at least high school) is a an essential foundation for every single person today.

今天教育(至少高中教育)对于每个人是十分重要的基础。

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To achieve this, we must engage and discuss, rather than lecture, when we reach a an apparent impasse.

为达成这点，当我们停留在一个表面的僵局时，要接触对话，而不是批评说教。

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Those who did well on the memory test had an increase in levels of immunoglobulin A, an antibody that's the body's first line of defense against germs.

那些在记忆测试中表现良好的人，其体内的免疫球蛋白 A 水平会升高。免疫球蛋白 A 是一种抗体，是人体抵御细菌的第一道防线。

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closing an air field in a populated area and building a new one on an existing U.S.base in the northern part of the island.

VOA: standard.2009.10.20

If you put Beta and you're paired with Alpha, you'll get a C and your pair an A.

如果你选β你对手选α,你得C你对手得A

耶鲁公开课 - 博弈论课程节选

Because I feel like a portrait is an answer to a question which is, 'What was this person like?'

因为我觉得肖像画是这样一个问题的答案，那就是“这个人长什么样？"

关于现代美术 - SpeakingMax英语口语达人

So Bank B paid Bank A an upfront premium for what is effectively an insurance policy.

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He said there were some rare finds including a an early docu-drama on a Zeppelin raid on London.

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"It's the difference between an A and an A-plus, " he was quoted as saying by AP news agency.

BBC: Hubble gyros fixed after struggle