That's a good idea. Do you know how to write an introductory letter?
好主意，你知道怎么样才能写好自荐信吗？
Mary: That's a good idea. Do you know how to write an introductory letter?
玛丽：好主意，你知道怎么样才能写好自荐信吗？
As there was no official seal on the introductory letter, the doorkeeper didn't let them in.
介绍信上没有印信，所以门卫没让他们进去。
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