Elevator "Thought Experiments"; Gravitational Red Shift, Light Bending.
电梯思想实验，重力红移，光弯曲。
There are two cases of thought experiments: gedanken experiment and thought experiment.
思维实验可分为两种情况：理想实验和思想实验。
Before such experiments, humans thought language skills were absent from the animal kingdom.
在做这些实验前，人们认为动物王国缺乏语言技能。
Before such experiments, humans thought language skills were absent from the animal kingdom.
在做这些实验前，人们认为动物王国缺乏语言技能。
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