Those things were nice, but not necessary.

那些事情确实很不错，但不是工作所必须的。

youdao

Familiarity with the following is also helpful, but not necessary.

熟悉以下内容有助于您理解本篇教程，但不是必需的。

youdao

To get better value out of this tutorial, it is recommended but not necessary to be familiar with.

为充分利用这个教程的价值，这里推荐几个您要熟悉的术语，但不是必要的。

youdao

But some experts believe that many of the C-sections are not medically necessary.

VOA: special.2009.11.24

The fact that I have this star here, this star here, this star here, is really just 'cause I'm a little anal and it looks pretty to make a little box out of everything but it's not strictly necessary.

事实上大家可以看到，这有颗星，这有颗星，这有颗星，其实是我手痒,这看起来像是用*围成个框，把它们包围起来,其实这是完全没有必要的。

哈佛公开课 - 计算机科学课程节选

Leisure does not simply mean rest or inactivity but leisure is necessary for education or what he sometimes calls by the term philosophy.

安逸不单意指休憩或静止不动,安逸是教育的必备条件,或是套用,他有时会使用的词汇－哲学。

耶鲁公开课 - 政治哲学导论课程节选

System risk is a concern of regulators but not necessary of C-level finance executives.

FORBES: Securities Settlement Cycle -- T+2 Gets Chatted Up But No Date

Don't Insist On Innovation: It's always nice to launch a treatment that represents a brand new way to treat a dreaded disease, but not necessary.

FORBES: Generic Competition Won't Fell Pfizer

Since you are probably not going to be eating a steak or chicken breast at the gym, a protein drink or supplement may be beneficial immediately before, during or after workouts, but is not necessary.

CNN: How should I eat to build muscle mass?