Then, on the last two days of the study, they could choose what they ate.
然后，在这项研究的最后两天里，他们可以选择他们吃什么。
In the new study, 47 volunteers were given two brain scans, each on different days.
在这项新的研究中，47个志愿受试者接受了两次脑扫描，每次扫描的时间不同。
After the travel, I will spend two days on study.
旅游之后，我会花两天时间在学习上。
After the travel, I will spend two days on study.
旅游之后，我会花两天时间在学习上。
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