In an Instagram post, Library of Congress moving image curator Jason Evans Groth said the film represents, "probably the first instance of a robot ever captured in a moving image." (The word "robot" didn't appear until 1921, when Czech dramatist Karel Čapek coined it in his science fiction play R.U.R..)
It is merely my personal understanding, without any guarantee of correctness.
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// 易错点1:边界处理 - 空链表直接返回空数组