Those who fear failure are destined not to succeed.
害怕失敗的人，注定不會成功。
Success is measured not just by profit, but by the positive impact we leave behind.
里氏替換原則是面向?qū)ο缶幊讨械囊粋€基本概念，確保派生類可以替代其基類使用，而不會改變程序的正確性。