Make sure you've signed the cheque before sealing the envelope.
一定要在支票上签了名再封信封。
《牛津词典》
2
Your kit should be waterproof; however, sealing your supplies inside of zipper baggies is usually the job all you need to do.
你的急救工具箱必须是防水的；不过，你通常需要做的工作就是密封拉链袋里面的用品。
3
The greatest single advance began in 1800 when a Frenchman, Nicolas Appert, discovered that he could preserve certain foods by sealing them in jars and keeping the air from them.