1·Riding a bike with only one wheel is a balancing act—that's why unicycles are used in the circus.
骑着只有一个轮子的自行车是一种平衡表演——这就是为什么独轮车被用于马戏团的原因。
2·He usually dances, jumps and unicycles on the high wire without a net, but his father insisted on using a net due to the unusual nature of the stunt.
艾阿拉通常都在没有保护网的情况下在高空钢丝上跳跃、舞动和踩单轮脚踏车，但他的父亲坚持用保护网，因为做这些高空绝技实在是很危险。