He told people at a conference, "There have been a couple of studies suggesting they are increasing their song output at night and during the day they are still singing.Singing is a costly behaviour and it takes energy."

  • 他在会议上告诉众人:“多项研究表明,它们晚上鸣叫的时间变多了,但白天也在不停鸣叫。这种鸣叫消耗很大,需要很多能量。”

  • 高考真题- 2015 四川 阅读D 2025-03-11 12:17:13

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