这种能力可以在脑海中勾勒出现实生活中不存在、不在场或过去曾经发生过的心理画面、物体或活动。
It is the ability of the mind to built mental scenes, objects or events that do not exist, are not present or have happened in the past.
登陆车装备了能够铲除冰和泥土的机器手，试图寻找生命曾经存在或现在依然存在的有机证明。
The lander is equipped with a robotic arm capable of scooping up ice and dirt to look for organic evidence that life once existed there, or even exists now.
然而，很难说出哪种木制品曾经存在于某个历史时期，因为它们并不像陶器或金属器皿的使用时间长久。
However, it is not always easy to say which wooden objects existed during a historical period because they often did not last as long as objects made from clay or metal.
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