他们必须遵循一些共同的标准。

They must follow some common standards.

youdao

学习语言必须遵循循序渐进的原则。

To learn a language we must follow the principle of gradual improvement.

《新英汉大辞典》

科学家们得出结论，太阳风的活动必须遵循相同的周期。

The scientists concluded that the solar wind activity must follow the same cycle.

youdao

Okay, common one, people see that now, well what that means is no longer is a three meal sufficient; there has to be a fourth.

这是人们常见到的一个广告,这意味着我们不再遵循每日三餐的准则,意味着我们必须吃第四餐

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选