练习材料：
Lesson 45：A clear conscience
任务配置：
L0+L1
知识笔记：
浊辅音【w】
发此音时，双唇向前突出，振动声带。
wood wind work
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单词积累（from 口语粉碎机）
rack my brain 绞尽脑汁，冥思苦想
I racked my brain, trying to figure out what he wanted for his birthday.
我想破了脑袋也没想出他到底要什么生日礼物。
on cloud nine
When they realized that they were having a baby, they were on cloud nine.
当他们得知即将为人父母时，他们高兴的不得了。
find your feet 适应新环境
I only recently joined the firm so I'm still finding my feet.
我最近刚到这家公司，还在适应中。
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