They have been seen together on two separate occasions.

他们有两次被人看见在一起。

《牛津词典》

The report says Thomas was becoming “extremely surveillance-conscious, ” and that agents “were made [recognized as agents] on two separate occasions.”

报告中说，托马斯变得有“非常强烈的电子跟踪意识”，有两次特工被她认了出来。

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One possible scenario for the next stage is that subsets of LUCA's virus-like elements broke away on two separate occasions, acquiring cell membranes and becoming simple cells.

接下来可能发生的情况是，LUCA类似病毒的部分机体，通过两次不同的契机，吸附了细胞膜而变成了简单的细胞。

youdao

Now, I've talked about laughter on two separate occasions and on each of the occasions when I talked in front of a large group like this somebody came up to me afterwards and said, "But I can."

我之前也有两次提到过笑,第一次,当我在这么一大群人面前讲完后,都会有人上来跟我说，“我可以”

耶鲁公开课 - 心理学导论课程节选

The 19-year-old from Tydavnet, Monaghan, was assaulted on two separate occasions on New Year's Eve.

BBC: Jason McGovern death: Police appeal for information

The results of this study were briefed earlier this year on two separate occasions to SEC officials, without apparent effect.

CENTERFORSECURITYPOLICY: The SEC's next shoe

According to court documents, Rogers told investigators he had fired the assault rifle at a gun range on two separate occasions.

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