needing great effort and energy 费力的；繁重的；艰苦的 a strenuous climb 艰难的攀登 Avoid strenuous exercise immediately after a meal. 刚吃完饭避免剧烈运动。 How about a stroll in the park? Nothing too strenuous. 在公园里散散步怎么样？不会太累的。 Avoid tasks which require strenuous physical activity. 避免从事繁重的体力活动。
showing great energy and purpose 劲头十足的；奋力的；顽强的
Word Originearly 17th cent.: from Latin strenuus ‘brisk’ + -ous.