感觉这个英语谜语挺有意思的，你猜一猜是哪个单词？
I have a 9 letter word, 123456789.
If I lose it, I die.
If I have 234, I can 1234.
If I have 56, I am very sick.
235 is the same as 789.
What is the word?
明天揭晓答案
heartbeat
