练习材料：
Lesson 79：By air
任务配置：
L0+L1
知识笔记：
单词积累（from口语粉碎机）
Can we just drop it？能不能不谈这事了
I think we’d better drop this subject.
我认为我们最好不要谈这个话题。
get to the bottom of sth.
She got suspicious and decided to get to the bottom of it.
她起了疑惑，便决定弄个水落石出。
appreciate
v欣赏，赏识
v涨价，增值
There's no point buying him expensive wines-he doesn't appreciate them.
不用给他买那么贵的酒，他不懂品酒。
The value of house here has appreciated by 50 percent in the last two years.
过去两年，这儿的房价上涨了50%
best-kept secret 鲜为人知的
dirty secret 底细
make no secret of 毫不掩饰
secret room 密室
secret talks 密谈
secret admirer 暗恋者
She makes no secret of her dislike of him.
她毫不掩饰自己对他的反感。
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