https://online2.tingclass.net/lesson/shi0529/0009/9907/72.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
yawn 哈欠，打哈欠
He closed the book, yawned, and went to bed.
他合上書，打了個哈欠，然后上床。
She got up from the chair with a big loud yawn.
她從椅子上站了起來，打個大大的哈欠。
瘋狂練習吧!
