an approximation of what really happened对事情真相的粗略描述

That is a fair approximation of the way in which the next boss is being chosen.这大致就是挑选下一任老板的方法。

His lips pulled back in an approximation of a smile.他把嘴微微一咧, 像是在微笑。

This is an approximation to the Greek word.这个词在意思上跟那个希腊词差不多。

Clearly that's an approximation, but my guess is there'll be a reasonable balance.很明显那是个粗略估计, 但我猜会有一笔不小的余额。