on or before

基本解释

Negotiation must be on or before the 15rh day of shipment.
自装船日起15天或之前议付。
Thirty-four of 35 were approved on or before the review time targets agreed to with industry under PDUFA, including three cancer drugs that FDA approved in less than six months.
34/35个药物是与药业工业在PDUFA下同意目标审评时间时或前被批准的，包括3个癌症药物FDA在短于6个月内批准。
blog.sina.com.cn
Remember to return your application form by mail on or before 15th May.
记住在五月15号或之前通过邮件上缴你是申请表。

C.D.C.officials say people should put on sunscreen before they leave home, even on cloudy or cool days.
So a bit of uninteresting math, a bit of focus on sizes of types, but any questions on syntax or concepts thus far before we now put this to the test?
一些比较无趣的数字，一些关于类型的大小,在我们现在进行试验之前,你们对这其中的语法或概念有什么问题吗？
哈佛公开课 - 计算机科学课程节选
I find that every time we do our meditation on Thursday, I'm always running to make it, or something happened before I get there, I'm like "Oh my God, meditation!"
我发现每次我们周四,要冥想时，我总是匆匆赶过去，或者是到达之前发生一点事故，我就好像“天哪，要冥想！“
普林斯顿公开课 - 人性课程节选

As of now, our opening brief is due on or before April 8, 2013.
FORBES: War Tax Resisters - Don't Call Them Frivolous