The inns are informal and dress-up clothes are not required for dinner.

小旅馆是非正式场所，所以就餐不需要考究的衣服。

《柯林斯英汉双解大词典》

youdao

In Kenya, in the past, students were not required to attend school and the education was not free, either.

在过去，肯尼亚不要求学生上学，教育也不是免费的。

youdao

The Food and Drug Administration is not required to follow the advice of its committees, but generally does.

VOA: special.2009.07.21

I have it on reserve, but that's not required for the mid-term; it's just if you're interested in seeing it.

我将其列为推荐书目,但不作为期中考试要求,如果你们感兴趣的话可以去读一下

耶鲁公开课 - 金融市场课程节选

So, many of you are new to the Boston area, now I still realize, and I want to let you know it's not required that you be a Red Sox fan to be at MIT.

你们中很多人新来到波士顿地区，现在我仍认识到，我想让你们知道在麻省理工学院,不一定必须做一个红袜队的球迷。

麻省理工公开课 - 化学原理课程节选

Consultants are not required to meet any educational requirements or have any specialized training.

FORBES: The Politics of Fraud: How Pension Politics Enable Money Managers To Commit Fraud (July 1, 2001)

In good times, when the FDIC fund was flush, banks were not required to pay premiums.

FORBES

The company is not required to pay the student or even provide housing or transportation assistance.

FORBES: What Is The Externship Program At MIT?