PENTIK
并不是由于他们从某个时候起同意这样做，或被迫这样做；相反，这是一个逐步发展的过程，在这一发展过程中，原因和结果相互作用、密切关联。意义编辑 播报任何简单而意义深远的发明都不是凭空出现在人们的脑海中的，必然有什么现象触发了灵感。正如古人见到水里漂着的木头而想到独木舟一样，车轮的发明也可能是受到了一些自然物的启发。
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