Children in this country watch TV all the time. They watch so much T. V. that they know how to find a boyfriend or a girlfriend when they are only seven or eight years old. This is extremely harmful.

你看这国家的小孩尽看电视，看得七、八岁就懂得男女交朋友，这真是害人太厉害了。

This is an elliptical sentence It may be rewritten like this: The triathlon maybe great for those who watch it, but how come the triathletes are willing to suffer so much physical hardship?

这项比赛对于观看者来说固然带劲，但究竟是什么让铁人三项的参赛者如此折磨他们的身体呢？