在动物中,除了人类和鸟类之外,它们所发出的声音,一般都是从一个起点滑动到另一终点;只有人和鸟类能够发出从一个音点跳动到另一个音点的音调,所以我们说:“鸟儿在歌唱”,外国人说“singing birds”。有一种叫金丝雀(canary-bird)的鸟儿,不仅能够唱出婉转的音调,还能模仿人所歌唱的旋律。美国南加 In animals, in addition to humans and birds, the sounds they make generally slide from one starting point to the other; only humans and birds can pronounce tones that beat from one sounding point to another, So we say: “Birds are singing,” foreigners say “singing birds.” There is a bird named canary-bird, which not only sings the melody but also imitates the melody sung by the people. United States Najib