"The milk boils."
Translation:O leite ferve.
Technically, "the milk boils" is correct, but not a natural or normal sentence. The best translation would be "The milk is boiling". Or, alternatively, if you were referring to milk in general (but when would you say this?), you would say, "Milk boils ..."
A scientist is making a bet with another scientist about whether or not milk boils in a vacuum. He sees it boiling, walks to his colleague, and says "Give me my ten bucks. The milk boils."