看三个句子,只有英语语法好的才能明白,很绕人的 .

第一个俩个都修饰,后一个修饰前一个

1 a boring cat or dog . boring= either a dog or a cat is boring
2 a boring cat or a dog . boring =both cat and dog are boring
3 a boring cat and a dog boring=a boring cat and a dog makes people boring

a boring cat or dog . boring修饰狗
a boring cat or a dog . boring 只修饰猫不修饰狗
a boring cat and a dog . boring 修饰的是猫

dog cat