台湾籍旅美老师今天交给我们的句子是：
Purring has traditionally been interpreted as happiness, but it's closer to a cat asking you to keep doing whatever you're doing.
猫发出呼噜声传统上被解读为它在表达快乐，但其实呼噜声更可能是猫在要求你继续你现在正在做的事。
学习重点：
1.purr 猫发出呼噜声
purr (v.) 猫发出呼噜声
hiss (v.) 发出嘶嘶声
yowl (v.) 嚎叫
2.traditionally 传统上；习惯上
traditionally (adv.) 传统上；习惯上
traditional (adj.) 传统的；惯例的
tradition (n.) 传统
3.interpret 解释，诠释；口译
interpret (v.) 解释，诠释；口译
interpreter (n.) 口译员
