练习材料：
Lesson 30-（1）：The death of a ghost
任务配置：
L0+L1
知识笔记：
单词积累（from 口语粉碎机）：
drown in sth 对。。。应接不暇
stay
be here to stay/ have come to stay 得到普遍认可，被广泛接受
submerge 1潜入水中，2淹没，掩盖
I'm drown in so much work.
这么多工作让我喘不过气来了。
The houses had been submerged by floodwater.
房子都被洪水淹没了。
His talent was submerged by his self-abasement.
他的才华被他的自卑淹没了。
on one's deathbed "临终，生命垂危"
He told me the truth on his deathbed.
他临终前像我吐露了实情。
in the hole 负债，欠钱，亏空
We've been in the hole since we bought our new house.
我们买了新房子之后就一直负债度日。
