Such frequent high-level contacts between China and the United States are really rare in the history of their relations.

Such frequent mutual visits show China and the United States carry out high-level communication free of obstruction, which is conducive to the improvement of bilateral ties.

The trip will enable senior US military officials to have a close look at China and help reduce their misjudgment and misunderstanding of China.

All these activities will create a favorable atmosphere for the impending Sino-US summit.