Have you ever thought about why many school buses and taxis are painted yellow, and stop signs red?

你有没有想过为什么许多校车和出租车都漆成黄色，而停止标志却漆成红色？

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Have you ever thought about the history of the schoolbag?

你有想过书包的历史吗？

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Have you ever thought about how these things can actually be put to good use?

你有没有想过这些东西怎样才能得到很好的利用？

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I don't know whether any of you have ever thought about this, and anything like this way.

不知道你们是否考虑过这个问题,或者以这种方式考虑问题

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Have you ever thought about changing those harsh chemicals into products you can actually tolerate.

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But have you ever thought about how the free market gives you so much for so little?

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But have you ever thought about how that makes the people you're supposed to care about, i.e.

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