英语语法分析

Since play fighting includes variations in speed and intensity, and quick role reversals involved with self-handicapping.

因为玩耍性打斗包括速度和强度的变化，以及与自我设限有关的角色快速转换。

The result can be sharp reversals in markets-and nasty surprises for momentum traders.

但在金融市场，结果可以很颠覆——势头交易者们被那些讨人厌的情况吓到。

And they believe that there are still many challenges and the potential for reversals in the future.

他们相信他们仍面临很多挑战，而且未来情况发生逆转的可能性依然存在。