“密封的”用英语怎么说

某些种类的食物也可以装入密封的金属罐里。Certain types of foods are also dispensed in pressurized canisters.密封的飞机内很少需要补充氧气。Supplementary oxygen is rarely needed in pressurized aircraft.这是一封未密封的信, 不要看.This is an unsealed letter, don't re...