By the time this situation occurs, rest is certainly a welcome relief, but not necessarily something to be valued in and of itself.

当这种情况发生时，休息当然是一种受欢迎的解脱，但它本身并不一定值得重视。

youdao

A wasp or bee sting is painful but not necessarily serious.

被黄蜂或蜜蜂蜇一下疼是疼，但未必碍事。

《牛津词典》

Well, yes, less likely, but not necessarily rare.

没错，几率变小但并非绝迹。

youdao

And the third is that we are formed more than we think in the first five years, but not necessarily the way Freud thought.

VOA: special.2010.04.13

The Turks have the saying because the Turks are very good at starting things off but not necessarily finishing them.

土耳其人非常擅长于开始某件事，但是并不一定完成事情,但是并不一定完成事情。

普林斯顿公开课 - 国际座谈会课程节选

OK -But there are people who use religion as their way, but not necessarily, to claim the right.

好，-有的人把宗教,当作一种获得权利的方式。

普林斯顿公开课 - 人性课程节选

Competition is good for the consumer, but not necessarily for an incumbent technology company, like Microsoft.

FORBES: Assessing Winners and Losers in Google's Worldwide Antitrust Battles

It will also slow, but not necessarily stop, Murdoch's attempt to take the company private.

FORBES: Gates Buys Into Pineapple Paradise

Many hospitals are trying to bring in healthier options, but not necessarily eliminating the harmful options.

CNN: Farmers markets bloom at hospitals