本文作者： 21ST
TAKE a quick look at a pigeon and a helicopter, and you may not notice anything in common between the two. But researchers have found that pigeons fly and turn in almost exactly the same way as helicopters do, and with the same agility (灵活性), according to a new study published on November 28 in Proceedings of the National Academy of Sciences (《美国国家科学院院刊》).