It's not about being perfect, it's about being better than you were yesterday.
可持续性必须成为每个化学制造过程的核心,否则我们可能会留下一个无法修复的世界。
老师声称代数是完美而自然的、我们应无条件地接受它,而我甚至不能理解什么是数。对我来说数学课完全就是恐怖和折磨。我完全不理解代数,这使我胆怯得不敢问任何问题。