New Words：

orchid ['ɔ:kid] n. 兰花
bulldozer ['bul.dəuzər] n. 推土机

Sample Sentences：

Can you operate a bulldozer?
Many kinds of wild orchid are becoming rare.
The wallpaper in our bedroom has a pattern of orchids.

rare[rer] adj. 稀少的；稀罕的；珍贵的

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