universal mill beam

例句：

1. 1.The universal truth is that every child deserves a chance to learn.
   一个普遍真理是，每个孩子都应该有学习的机会。
2. 2.The universal language of the internet is English.
   互联网上使用的语言是英语。
3. 3. The universal rule is to always follow the instructions carefully.
   普遍规则是，总是仔细遵循指示。