A：what is this?
B：it is a backpack .
A：how do you spell it
B：B-A-C-K-P-A-C-K.
A：Is this your backpack?
B：yes ,it is .
A：oh,here youa re.
B:thank you very uch
用this,backpack,spell,B-A-C-K-P-A-C-K,your,Yes,my,thanks遍一段对话
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