练习材料：
Lesson 47：A thirsty ghost
任务配置：
L0+L1
知识笔记：
清辅音【tr】
上下齿自然合拢，嘴唇张开不要太大。舌端贴住齿龈，堵住气流。然后舌尖略微下降，气流随之泄出。
tree trade ostrich
浊辅音【dr】
舌端贴住齿龈，堵住气流。舌尖略微下降，气流随之泄出形成先破擦，同时声带震动发出/dz/音。
beds cards rides
双唇稍稍突出，略成圆形。舌身保持发/r/的姿势，舌尖贴在齿龈后部，堵住气流。舌头放开，让气流从舌尖和齿龈间冲出，冲破阻碍发出短促的/d/后立即发/r/。
drive drop drum
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单词积累
haunt
n. 常到的地方
vt. 缠住；常到；出没(像鬼魂一样)
vi. 徘徊；出没(像鬼魂一样)
The college library is a favorite haunt.
大学图书馆是人们喜欢的地方。
The memory in later times returned to haunt him.
那回忆后来经常浮现在他脑海。
单词积累（from 口语粉碎机）
go down the drain 白白浪费，付诸东流
You may rest assured that I will definitely not let our money go down the drain.
你就把心放在肚子里吧，我是一定不会让这笔钱打水漂的。
not much of a 算不上是
goody two-shoes
老好人，伪善者
Guess he is not too much of a goody two-shoes.
看来他也不是个老好人。
out of the woods 摆脱困境，度过难关
neck of the woods 某个特定的地方
fight against 抵抗
fight back 忍住，抑制住
fight the urge to 忍住
The doctor says that he is much better but is still not out of the woods.
医生说他好多了，但还未脱离危险。
He's from your neck of the woods.
他是你们那里人。
I desperately fought the urge to giggle.
我拼命忍住不笑。
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