There is no need to worry.

不必担心。

《新英汉大辞典》

There's no need to worry so.

没必要这样着急。

《牛津词典》

'There's no need to worry,' he said soothingly.

“不必担忧。”他宽慰道。

《牛津词典》

Norbert Sporns say there's no need to worry.

VOA: standard.2010.05.27

No need to worry if you're doing things right.

如果你按照教义去做就不必担心

耶鲁公开课 - 古希腊历史简介课程节选

No need to worry that a full airing of the simple facts will damage its brand.

FORBES: The Advantages -- and Hidden Dangers -- in Taco Bell's 'Where's the Beef' Litigation Strategy

No need to worry about that, it was argued: the flow of capital reflected these countries' economic miracles.

ECONOMIST: As bad as it gets?

There is no need to worry too much about the return on investment.

FORBES: Market Economy Distortions Can Get Very Dangerous