函的英文
“函”对应的英文单词有：envelop、letter、envelope、case、a surname ，一共5个，具体意思及用法如下：
envelop包围，包住；笼罩，遮盖
letter证书，许可证；字母，文字；信；字面意义
envelope壳层，外壳；包裹物；信封，封皮；[生物学]膜，包袋
case情况，状况；诉讼（事件），案件，判例；（实）例，事例；容器（箱，盒）
a surname姓
与函相关的短语
促销函Sales Letters;Letters of Promotion
鼓励函Letter of Encouragement
函聘invite by letter
函授teach by correspondence
咨询函Consulting Letter;Letter of Inquiry;Inquiry & Request
录用函Employ Letter;Job Offer
填料函Stuffing;gland box;packing gland
敕函Epistula
函胡ambiguous;vague
函告inform by letter
保证函Letter of Undertaking;l/gletter of guarantee;[贸易] Letter of Guarantee;guarantee letter
函使mailman;postman
函授大学correspondence college
应聘函A letter of application
函大correspondence college
函购mail order;purchase by mail
函数function
函索demand by communication
函复reply by letter
函件letters
函电letter and telegram
函证Letter of Confirmation;circulars for confirmation;confirmation;External confirmation