hard-boil       
verb [ T ] uk/ˌhɑːdˈbɔɪl/ us/ˌhɑːrdˈbɔɪl/
 将(鸡蛋)煮至全熟
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。 
 - More examples
 - He hard-boiled six eggs, let them cool, and then chopped them and mixed them with mayonnaise.
 - I had to teach my son some basic cooking skills before he went to university, such as how to hard-boil an egg.