"多数决定原则" can be translated into English as "the principle of majority decision" or "the majority rule principle".
Both expressions are commonly used and convey the idea that decisions are made based on the preference or vote of the majority.
"The principle of majority decision" emphasizes the fundamental concept of making choices based on the will of the majority.
"The majority rule principle" similarly highlights the rule or guideline that decisions should follow the majority's choice.
Choose the one that best fits the context or your preference.