A:Mike promised to help us.
邁克答應幫助我們。
B:Mike? How can you trust him to help us?
邁克?你怎么能相信他會來幫助我們?
A:Why not?
為什么不能呢?
B:He is too unpredictable. He says anything that pops into his head. And then he forgets it all.
他太讓人難以琢磨。他總是想起什么就說什么,可是過后一會兒就忘了一切。