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罗斯:
I`m in the mood to write a letter to my mother. 
我很想写封信给我妈妈.
凯西:
That`s a nice thing to do.
那是件好事.
罗斯:
I haven`t written to her for a long time.
我很久没有写信给她了.
凯西:
I`m sure she will be happy to hear from you.
我确信她收到你的信会很高兴的.