It must be stressed that this disease is very rare.

必须着重指出，这种病非常罕见。

《牛津词典》

It must be stressed that we should attach great importance to environmental protection.

必须着重指出的是，我们必须重视环保。

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Therefore, it must be stressed that the majority of your SEO efforts should be spent seeking inbound links, not endlessly tweaking your own website.

因此必须强调的是，你得把大部分搜索引擎优化工作放在寻找入站链接上，而不是永无止尽地调整你的网站页面。

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Back to reality, it must be stressed that applied to our present economic situation, whether government spending is in deficit, balanced, or in surplus is immaterial.

FORBES: Everything the Hysterics Tell You About Budget Deficits Is Wrong

The organisation leading the StopKony campaign issued a response on its website to these points, and it must be stressed that the group has been pushing the White House on this issue for some time.

BBC: Joseph Kony campaign under fire

Mr Fillon said he favoured the idea, floated by Mr Cope, of a party referendum in January, but stressed it must be held "in conditions of objectivity".

BBC: France politics: UMP party splits in parliament