释义：他或许认为，气通过凝聚形成各种物质，万物因此得以成形。

【释义】多次迁徙而没有固定的居所，但只要心如长者，就不会有忧患。

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.