The maintenance of a large inventory, while necessary, is not advantageous for many reasons.

虽然是必须的，但是由于许多原因，大库存的维护是不利的。

youdao

Some details, while necessary from the insurance company's perspective, will be omitted if they don't add value to our discussion.

有些细节虽然从保险公司的角度看是必需的，但是如果不会为我们的讨论增添价值，我们将省略这些细节。

youdao

That it was necessary to stop - for a while - all payments in gold or silver.

VOA: special.2009.01.01

Why? Because good will and idealism, while necessary,they are not sufficient.

为什么呢？因为美好的意愿和理想主义，虽然必要，但却是不够的。

哈佛公开课 - 幸福课课程节选

Farmers know that it is necessary to make hay while the sun shines.

VOA: special.2010.01.31

The drastic cost-cutting, while necessary, would have serious knock-on effects for many in the UK, Mr Philpott said.

BBC: UK cuts 'to push unemployment close to 3m'

Facebook spent 2012 becoming a mobile company (and Home is a way to extend mobile presence), which while necessary is not a route to riches.

FORBES: Facebook Extends Charging For Messages. Great Move!

But while necessary, banking reform is not, on its own, sufficient.

ECONOMIST: Too weak to work? | The