在数学中，真理总是相对于你所在的系统而言的。
In mathematics, truth is always relative to the system you're working in.
However difficult life may seem, there is always something you can do and succeed at.
安全不仅仅是一个优先事项，它是必须融入我们所做一切的核心价值观。
城市是人类最伟大的发明。
Every cut should have a purpose, a reason to be there.