If you hard-boil an egg, you heat it in its shell in boiling water until both the white and yellow parts are solid.

I like to hard-boil my eggs for at least ten minutes.

At Easter, they like to hard-boil eggs and then decorate them. 复活节的时候，他们喜欢把鸡蛋煮至全熟，然后进行装饰。