It 's impossible to focus on studying if you have all sorts of negative ideas about studying.

如果你对学习有很多消极思想，就不可能把注意力集中在学习上。

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And you can experience it all on the Internet at americanhistory-dot-s-i-dot-e-d-u.

VOA: special.2010.01.11

So whether we finish it today, or more likely when we finish it up on Friday, once we get passed isoelectronic atoms, that's it, that's all you need to study for this first exam.

因此，我们也许今天讲完，或者更有可能周五讲完，无论如何，就到我们讲完等电子原子为止，这是你们第一次考试所需要准备的全部内容。

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I expect most everybody could pass all of the questions but it's just to keep you on track and keep you going.

我希望大家在所有的问题上都能及格,但这只是想让大家不要掉队,督促一下

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"It's all on you, and you have to make the right decisions, " Marrone said following practice Friday.

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It's all on you, senator.

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"It kind of gives you a laser focus on shooting, because it's really all you can work on for a while, " said Smith.

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