Her sudden appearance did not seem to perturb him in the least.

她的突然出现似乎一点也没有令他不安。

《牛津词典》

The sudden appearance of a security guard caused them to drop the money and run.

保安人员突然出现，他们丢下钱就跑了。

《牛津词典》

His sudden appearance took us quite by surprise.

他的突然出现使我们非常惊讶。

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Now not only does Phoebus Apollo make a sudden appearance, but he seems actually to interrupt the speaker of the poem in order to correct him.

不仅是他的登场让人措手不及，他似乎也打断了诗歌创作者的叙述,以此来对他进行纠正。

耶鲁公开课 - 弥尔顿课程节选

It's that moment in which Phoebus Apollo makes a sudden and unexpected appearance.

太阳神阿波罗,突然而又出人意料的出现了。

耶鲁公开课 - 弥尔顿课程节选

The sudden appearance of "super-abled" people could put new and unforeseen strains on our society.

WSJ: Bionic Brains and Beyond

Ahead of the 2008 US presidential elections, the anti-Israel pressure group J Street made a sudden appearance.

CENTERFORSECURITYPOLICY: Defeating the Jewish Alinskyites

In late May producers were dumbstruck by the sudden appearance of Willie Nelson's braided head on one of the screens.

FORBES: Geek TV