例句：
1、It is of the same load as a 737 jet.
它的'負載與737噴氣式飛機相同。
2、0It is of first importance to spread cultural and scientific knowledge among the people.
普及文化科學是頭等重要的。
3、It is of the greatest usefulness.
它是極有用的。
4、It is of convenient length.
它的長度合適。
5、Although longitudinal diffusion is most rapid, it is of practical importance.
雖然縱向擴散速度最快，但其具有重要的現實意義。