Once visit Shanghai is not enough.

只来一次上海是不够的。

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He will visit once every two weeks to see how his new employees are progressing.

他将每两周视察一次以看看他的新雇员们进展如何。

《柯林斯英汉双解大词典》

"Have they been to visit you yet?"—"Just the once, yeah."

“他们已经去看过你了吗？”— “来过，就那一次。”

《柯林斯英汉双解大词典》

Torrey says he was lucky to visit it not once,but twice, at the June and December solstices.

VOA: standard.2009.12.15

I once went to visit the summer palace that he created and that Nicholas II loved so much there.

我曾到过他修建的夏宫看过,据说尼古拉二世特别喜欢那个地方

耶鲁公开课 - 欧洲文明课程节选

Do come and visit once a while.

有空过来看看。

哈佛公开课 - 幸福课课程节选

Once you visit a place, you can then return using a fast travel mode that gets you there without incident, but it does use up the same in-game time as if you had walked there.

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Once registered, visit A History of the World in Norfolk and click on 'Add an Object'.

BBC: Preview: A History of the World shows Norfolk treasures

I'd only been outside of Europe once, to visit the United States.

WSJ: Marcus Samuelsson on Traveling to Japan to Eat Fugu | Traveler's Tale