成立日的英文：
establishment day

establishment是什么意思：
n. 建立；设立，创立；机构；公司；会社；学校；机关；企业

Eastern Establishment
东部权势集团

This community was the heart of the American Establishment.
这个集团是美国权势集团的心脏。

The eradication of an established infestation is not easy
根除昆虫蔓延是不容易的。

At the corner of this square there is a printing establishment
在那广场角上有个印刷局。

An assessment of conditions for establishing the project
本项目建设条件评估

day是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。

It was a fateful day.
那是个不祥的日子。

Meantime, from day to day they endure.
同时，一天天他们捱了下去。