同学你好，该知识点来自沪江网校《【Uni智能】雅思7分一站式VIP-大学起点【签约现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好，
There is no doubt that many virtues could be gained via undertaking risky sports activities.
毫无疑问，通过从事有风险的体育活动可以获得许多美德。

There is no doubt这个一个固定句子”毫无疑问“。然后同位语从句的引导词是that,用来解释前面的名词.
从句里面：因many virtuea许多美德是被人夸的，virtuea could be gained 启动被动时态。“获得许多美德”via undertaking risky sports activities “通过从事有风险的体育活动”