They have been seen together on two separate occasions.
他们有两次被人看见在一起。
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。
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。
To study how the brains of boys with autism changed over time they scanned 13 boys diagnosed with autism and a control group of seven non-autistic boys on two separate occasions.
为了研究患有自闭症的男孩的大脑是怎样随时间改变的，他们扫描了13个被诊断出患有自闭症的男孩，以及作为对照组的7个正常男孩，分开观察。
To study how the brains of boys with autism changed over time, they scanned 13 boys diagnosed with autism and a control group of seven non-autistic boys on two separate occasions.
为了研究患有自闭症的男孩的大脑是怎样随时间改变的，他们扫描了13个被诊断出患有自闭症的男孩，以及作为对照组的7个正常男孩，分开观察。
In other experiments, two different birds, called Pierre and Corbeau, also made the first approach with tools on three separate occasions.
在其它实验中，两只不同的鸟——皮埃尔和科布，也在三个独立场景中利用了工具进行初次接触。
In other experiments, two different birds, called Pierre and Corbeau, also made the first approach with tools on three separate occasions.
在其它实验中，两只不同的鸟——皮埃尔和科布，也在三个独立场景中利用了工具进行初次接触。
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