11.21

1. "The beautiful thing about learning is that no one can take it away from you." – 学习的美好之处在于，没有人能把它从你身边带走。 2. "Success is not the key to happiness. Happiness is the key to success." – 成功不是幸福的关键，幸福才是成功的关键。 3. "In the middle of difficulty lies opportunity." – 困难之中蕴藏着机遇。