Science can be hands-on, you might be down at the lake picking up algae and studying them or something, that would be hands-on.

科学研究也是要动手的,你可能会到湖底,收集水藻并研究它们,这就是动手操作

耶鲁公开课 - 生物医学工程探索课程节选

It's rather, "Can you imagine a world in which the very thing that you really are picking out when you refer to me by the name Shelly-- namely this thing-- can you imagine a world in which that thing exists, but the thing that you're picking up when you use the word Kagan does not exist?"

而是在于,你能不能想象在一个世界里,你用薛立这个名字,指的那个人,也就是这个东西,你能不能想象在一个世界里某个东西存在,而你用卡根这个词,所指的这个东西却不存在

耶鲁公开课 - 死亡课程节选