预测是非常困难的，尤其是关于未来。
Prediction is very difficult, especially about the future.
创新既需要创造力，也需要严格的测试。
To dance,clap hands,exalt,shout,skip,roll on, float on
The first step in the art of cutting metals is to find a man who has the necessary skill and experience.
The best performance improvement is the transition from the nonworking state to the working state.
