弄脏巢

dirt cheapest───最便宜的

driving test───汽车驾驶员行驶执照的考试；打桩试验

fly the nest───离开父母

ring the bell───鸣钟；按门铃

with the best───跟任何人一样好

denying the antecedent───否认前因

emptying the wastebasket───清空废纸篓

Turing test───图灵检定

• dirtying the air with smog
• dirtying the nest