n. [鸟]鸟类；禽（bird 的复数）
v. 打鸟；观察研究野鸟；起哄（bird 的三单形式）
1.Birds wheeled above us in the sky.
鸟儿在我们上空盘旋。
2.The baby fish are easy prey for birds.
这些小鱼很容易被鸟类捕食。
3.I have kept birds for some 30 years.
我养鸟大约有三十年了。
4.Migrating birds filled the pale sky.
迁徙的鸟布满了灰白的天空。
5.The birds were singing outside my window.
鸟儿在我窗外啼啭。
6.Birds feed on nuts and berries in the winter.
鸟类靠坚果和浆果过冬。