"Human well-being is, on average, growing," the authors write.
“人类的幸福度，平均来讲，是提升的。”作者如此写道。
The authors write that relative weight is what is most dangerous in crashes.
研究报告的作者写道，车祸中双方汽车重量相差越大，就越危险。
The authors write that relative weight is what is most dangerous in crashes.
研究报告的作者写道，车祸中双方汽车重量相差越大，就越危险。
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