司空见惯的英文：
[Literal Meaning]
official title/see/common
not to be surprised to see a common sight

[解释]
某事常见，不足为奇。

[Explanation]
to be a common occurrence

[例子]
现在年轻人未婚同居已经是司空见惯的事情了。

[Example]
Now cohabitation before marriage is a common occurrence among young people.

[英文等价词]
all in a day's work

Gratuity is customary in this money-mad metropolis.
在这个金钱至上的大都市里，给小费是司空见惯的。

Depend upon it, there is nothing so unnatural as the commonplace.
毫无疑问，没有什么像司空见惯的东西那样不自然的了。

Desert and reward seldom keep company
功与赏绝少结伴而行;赏罚不明乃司空见惯

Freakish phenomena are becoming less freaky all around the world.
在全球各地，反常的气候渐渐变得不那么“反常”了——人们都对此司空见惯。

It was a norm for any major company.
这在各大公司都是司空见惯的。

Earthquakes will have become almost commonplace by this time.
地震在这时候已经变成司空见惯的事。

In textile areas it has long been customary for mothers to go out to work.
在纺织工业区，母亲外出工作早已司空见惯。

A matter of repeated occurrence like this will not astonish people.
关于这种司空见惯的问题，人们不会吃惊的。

Illegal traffic in protected animals is quite common there.
非法买卖受保护的动物在那里是司空见惯的事。

Graham was accustomed to deathbed scenes, and ordinarily they produced but little impression on him
格雷厄姆大夫对垂死者的惨状一向司空见惯，无动于衷。