My bike chain broken, please help me for a new, this is my warranty book.
我的自行车链条断了, 请帮我换一条新的, 这是我的保修书.
While mother was cooking, father was repairing the bookcase.
当妈妈在烧饭时, 爸爸在修书架.
Si Maqian devoted himself to the compiling of history books.
司马迁一直致力于修书治史的工作.
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