以下是一些挑戰的英文佳句：
1. "Challenge yourself and never give up."
2. "Take on challenges to achieve greatness."
3. "Challenge is the mother of innovation."
4. "Only through challenge can we grow and improve."
5. "Challenge others to be better, not to be defeated."
6. "Challenge accepted! Let's bring out the best in each other."
7. "Challenges are opportunities in disguise."
8. "In the face of challenges, courage is what matters most."
9. "Be prepared for challenges, for opportunities will come when you are."
10. "Challenges are not something to fear, but something to embrace."