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sign := if x 0 { 1 } else if x < 0 { -1 } else { 0 };，更多细节参见PG官网
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The irony is stark: replacing human labor with artificial agents might simply recreate centuries-old conflicts between labor and capital.
第二个动作是 「善用实况照片（Live Photo）」。。业内人士推荐博客作为进阶阅读