估计地球的年龄大约为46亿年。

The age of the earth is reckoned at about 4 600 million years.

《牛津词典》

我一年的行驶里程大约为1万英里。

My annual mileage is about 10 000.

《牛津词典》

地球离最近的恒星大约为4光年。

The nearest star to earth is about 4 light years away.

《牛津词典》

If you go to Denmark and you break a $100 bill, you're going to be given one of these, undoubtedly, the 500 kroner note, which is worth about $75-80, and it has Niels Bohr on it.

如果你去了丹麦，换了100美元，毫无疑问，你会得到其中一个像这样的，500挪威币，约为75-80美元，上面有波尔的头像。

麻省理工公开课 - 固态化学导论课程节选

It is about 10,000 to one, the ratio 10000 of the nuclear dimension to the entire atomic dimension.

原子核和整个原子的大小比例,约为1：

麻省理工公开课 - 固态化学导论课程节选

They probably succeeded in subduing some of their neighbors, collecting tribute--there's some controversy about that but in about 922 this kingdom divided into two smaller and lesser kingdoms that fell in importance.

也可能成功征服了周围的一些邻国并接受朝贡，但这点是有争议的,但约公元前922年，这个王国,分裂为两个更小更次要的国家,重要性当然也随之降低。

耶鲁公开课 - 旧约导论课程节选