sealed orders

instructions given to an officer in the armed forces in a sealed envelope to be opened at a certain time or place, usu in wartime 密封指令（给军官的命令, 封合於信封内, 在某时或某处方可开启, 通常用於战时）.

sea-island cotton, sea-kale, sea-legs, sea-level, sea-lion, sea-pink, sea-shore, sea-sick, sea-urchin (also urchin), sea-wall, sea-way, seabed, seaboard, seafarer, seafaring, seafood, seagoing, seagull, seal, sealant, sealing, sealing-wax, sealskin, Sealyham, seam, seaman, seamanlike, seamanship, seamed, seamless, seamstress (Brit also sempstress), seamy, seance (also seance), seaplane, seaport, sear, search, search after, search for, search out,