11.21

1. 英文：Regular physical exercise can enhance physical fitness and relieve stress caused by study or work. 翻译：规律的体育锻炼能增强体质，缓解学习或工作带来的压力。​2. 英文：Environmental protection has become a global issue that requires the joint efforts of all countries. 翻译：环境保护已成为全球性问题，需要各国共同努力。​3. 英文：Reading classic works helps broaden horizons and improve one's literary accomplishment. 翻译：阅读经典作品有助于开阔视野，提升文学素养。