A wide range of Christmas tree, there are also natural pine tree, artificial Christmas trees and white Christmas tree.
圣诞树的种类繁多，有天然松柏圣诞树、也有人造圣诞树及白色圣诞树。
2
David Haskell created artificial nests with clay eggs and placed them on the ground beside a tape recorder that played the begging calls of either tree-nesting or of ground-nesting warblers.
David Haskell 制作了一些盛有泥蛋的人造鸟巢并把它们放在地面上，旁边有一个录音机，播放着树莺或地面莺的的乞食叫声。
3
Then she came to America and for two or three years she taught us the difference between the nightingale that sings in the tree tops and the artificial bird that goes with a spring.