他说这是一举三得：了解时事，熟悉地理，学习英文。
He said it was threefold: to understand current events, familiar with the geography, to learn English.
这简直是一个一举三得的天才创意，既能同时减少碳排放，又能减少电力消耗，还能减少光污染，而不用牺牲路灯带来的安全感。
This ingenious triple threat of an idea could simultaneously reduce carbon emissions, cut electricity costs and reduce light pollution, without sacrificing the safety that streetlights bring.
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