The way events have unfolded over the past few months simply has no precedent.

过去几个月中事情的演变方式就前所未有。

youdao

The new 600MW air-refrigeration turbine have greatly improved on the structure, at present, there is no domestic precedent on the assembly .

新一代600MW空冷机组在结构上做了很大改进，其装配在国内尚无先例。

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Since there is no precedent to build such a complex and unique country as China, we have to do it by trial and error.

建设中国这样一个独特而复杂的大国，我们没有现成的套路，只能边试边干。

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For that reason, we have no precedent to follow on the involvement of the independent counsel in our proceedings.

CNN: Transcript: Chairman Hyde's opening statement

There is no such precedent for Apple TV and consumers have yet to express the collective need to move PC-based content into their living rooms.

ENGADGET: Switched On: Apple TV deletes DMA deficiencies

"Hopefully, this resolution will set a precedent so that no female athlete in the future will have to experience the long delays and public scrutiny which Caster has been forced to endure, " added Nott's fellow lawyer Jeffrey Kessler.

BBC: Athlete Caster Semenya free to compete