// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
What we see is that there are in fact two entangled traditions of “knocking on things for good luck”: touching iron, and touching wood. We also find that they are widely distributed, but also have a pretty clear cluster around the Mediterranean and Europe.
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看人力资源要素，16至59岁人口85136万人，拥有全球规模最宏大和门类最齐全的人才资源，促进劳动力和人才有序流动，将凝聚支撑高水平科技自立自强的人才发展合力。
抗議其後演變為民主運動，成為1997年香港主權移交中國以來，對政府最嚴峻的挑戰。