Any problems concentrating in school lately?

最近上课能集中精神吗？

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Even milder cases often experience learning difficulties and have problems concentrating.

即使病情较轻也往往会遇到学习困难并难以集中注意力。

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Other symptoms include indigestion, loss of appetite, difficulty concentrating, memory problems, clumsiness, feeling generally unwell, lack of energy, fatigue and irritability.

其他症状包括消化不良、没有胃口、难以集中精神、记忆有问题、笨拙、总体感觉不好、缺乏精力，疲倦和易怒。

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The ASVA conference in Crieff, Perthshire, has been aimed at giving delegates a set of tools to combat these problems by concentrating on issues like branding, meeting visitors' expectations and making the most of Scotland's natural assets.

BBC: Tourism leaders look for answers

But our training prepared us by concentrating on failures and solving big problems under extreme pressure.

WSJ: Buzz Aldrin on His Lunar Home, the Eagle

"I hope that we resolve this issue sooner rather than later because the state of Illinois has some tremendous financial problems to deal with, which in my view is where we should be concentrating our focus and our time, " he said.

CNN: STORY HIGHLIGHTS