Partly because most RACES here in the UK don't allow it, but also because I like to be able to concentrate on what's going on around me.

部分原因是因为在英国举行的大多数比赛不允许这种行为，也因为我喜欢在比赛中能够集中精神关注发生在我周围的一切。

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Accordingly, there are times when we procrastinate simply because it is difficult for us to concentrate on a project, the benefits of which will not be realized until some time in the future.

相应地，我们多次拖延只是因为一旦做一件工作要很久以后才能有现实的好处，这样就很难集中精神到这件工作上。

youdao

Ron Paul: "I want to get rid of one item to concentrate on, because Ithink it's the worst part."

罗恩·保罗：“我想先集中精力废除一个项目，因为我认为这是最恶劣的部分。”

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Mr Teodoro resigned as chairman of the party late last month, ostensibly because he wants to concentrate on his campaign, though in reality, perhaps, because he, too, wants to distance himself from Mrs Arroyo.

ECONOMIST: Anyone but Arroyo

They wanted to wait until 1 September to address the issues he had because they wanted to concentrate on the transfer window.

BBC: Mancini hopes to persuade Tevez to stay at Man City

While these companies have been investing heavily since the 90s, Ford was late to join the party, primarily because it chose to concentrate more on its American operations.

FORBES: China Has Growth But We're Tapping The Brakes On Ford At $15