例句：
1、It is of the same load as a 737 jet.
它的'负载与737喷气式飞机相同。
2、0It is of first importance to spread cultural and scientific knowledge among the people.
普及文化科学是头等重要的。
3、It is of the greatest usefulness.
它是极有用的。
4、It is of convenient length.
它的长度合适。
5、Although longitudinal diffusion is most rapid, it is of practical importance.
虽然纵向扩散速度最快，但其具有重要的现实意义。