Transportation, power and efficiency make up the "big three."

交通、能源和效率合称“大三样”。

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British people do not make small talk with strangers, and they would never strike up conversation with someone on public transportation.

英国人不会去和陌生人寒暄，也绝不会再公共交通工具上谈话。

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That's because transportation such as cars make up the fastest growing source of emissions of CO2 and other greenhouse gases.

这是因为像汽车的这种运输构成了二氧化碳和其它温室气体排放增长最快的源头。

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Making matters worse, chronic absence is more harmful to lower-income students, experts say, because families have less access to transportation and health care, and fewer resources to make up for lost time in the classroom.

WSJ: Districts find youngest students among most absent