但是每天傍晚，他们坐在村中的广场上，听着昆虫和青蛙的叫声。
But in the evenings they sit in the village square and listen to sounds of insects and frogs.
那里的统计员通过听青蛙的叫声来辨别青蛙的种类，然后给出数量的估计。
Volunteers listen for frogs, identify the species, and give population estimates.
北美两栖监测计划招募和培训一批忠诚的志愿观察者倾听研究青蛙的叫声。
The North American Amphibian Monitoring Program recruits and trains committed volunteer observers to listen for and identify frog calls.
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