封冻: freeze-up日期: date平均封冻日期: mean freeze-up date最晚封冻日: latest complete freezing最早封冻日: earliest complete freezing解冻日期: break－udate平均解冻日期: mean breakup date封冻: freeze-up◇封冻期 a period of freezing weather; freeze; freeze-up开冻日: first open water封冻（封河）: freeze－up封冻港: ice harbor封冻湖: ice-covered lake封冻期: freezeuperiod; icebound season; period of freezing weather; period of ice-cover; shutdown period初次解冻日: first open water第一解冻日: fow first open water; first-open-water最晚解冻日: latest breakup日期: date 出生日期 date of birth; 开会的日期 the date for the meeting; 没有日期 without date; 载明日期 bear date; 别忘了信上写明日期。 don't forget to date your letters. 起程的日期定了吗? has the departure date been fixed?; 日期戳 dater 被冰封冻的: ice bound; ice-bound常年封冻湖: perennially frozen lake非封冻水道: nonfreezing stream封冻冰缘: ice edge of freeze－up封冻河流: freeze－ustream; ice-covered stream封冻径流: enclosed flow封冻开始: beginning of freeze-up封冻历时: freeze－uduration; lasting of ice cover
