about和on的用法區別

　　例句：

　　It's about this high.

　　大約有這么高。

　　There was much discussion about the reasons for the failure.

　　就失敗的原因進行了大量的討論。

　　The population is increasing at about 6% per year.

　　人口以每年約6%的速度增加。

　　I got to know David on the second day of middle school.

　　我在上中學的第二天就認識了大衛。

　　In our company, quality is high on the agenda.

　　我們公司高度重視質量。

　　The university is on the left bank of the river.

　　大學在河的左岸。