科研人员坦承，有些行为带来的潜在益处似乎很不稳妥，如少开车、多走路和多骑车。
Some possible benefits seemed highly speculative, the researchers conceded, based on people driving less and walking and cycling more.
科研人员坦承，有些行为带来的潜在益处似乎很不稳妥，如少开车、多走路和多骑车。
Some possible benefits seemed highly speculative, the researchers conceded, based on people driving less and walking and cycling more.
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