John is about the same age as Tom.about怎么理解?能不能举类似的例子比较下!

about 大约
比如：The tree is about 10 meters high. 这棵树大约10米高。
the river is about 10 meter wide. 这条河大约10米宽。
【俊狼猎英】 团队为您解答，欢迎追问

about （prep, ad.）关于，在各处；大约，到处 关于，在各处；大约，
My mother often spoke to me about you.家母常和我谈起你。
She sat up and looked about her. 她坐了起来,环顾四周。
It happened about 5 o'clock in the morning. 这事发生在早晨约莫五点钟的时候。
She likes to walk about. 她喜爱四处走走。
John is about the same age as Tom.约翰和汤姆的年龄相仿。

about 大约的意思。如：
It is about 800 miles from here to Inner *. 从这儿到内蒙大约800英里。

about大约 在这里的意思：约翰跟吉姆差不多大。
eg：it's about 8:00. 大约八点了

副词 .意思为：大约;几乎
1.The interview lasted about an hour.
2.Mary's mother is about 50 years old.

就是大约的意思，把about删掉也是可以的。
就跟John is about 160cm. 是一样用的