（二）违反国家规定，在文物保护单位附近进行爆破、钻探、挖掘等活动，危及文物安全的。
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This article originally appeared on Engadget at https://www.engadget.com/mobile/smartphones/tecno-just-unveiled-a-ridiculously-thin-modular-smartphone-concept-design-194741776.html?src=rss，更多细节参见同城约会
A new transaction is added to the system. It is then relayed to a network of computers located around the world. The computers then solve equations to ensure the authenticity of the transaction.
if (n <= 1) return;