warble [ˈwɔ:bl] v.鸟鸣,用柔和的颤声唱 n.鸟啭,颤声 squawk [skwɔ:k] n.(尤指鸟受惊时)粗厉的叫声 The hen gave a squawk when it saw the cat.母鸡见到猫时咯咯叫了起来.vi.发出粗厉的叫声,咯咯地...