书函，读音是shū hán，汉语词语，意思是文书的封套。
n. letter ; correspondence
我能打字，处理文件书函。
由于公司职员不多，我要执行不同职务，我能打字，处理文件书函，操作电话及当接线员。
Because of the limited number of staff of the company, I have to carry out different responsibilities. I can type, handle paperwork and correspondence, operate a switchboard and act as a receptionist.
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