Pros and Cons of BlockchainBlockchain has many advantages and disadvantages.
五奶奶说，那时候闻讯赶来的亲戚，少说都有20个，大伙折腾了一上午把幸存的骡子弄上来。亲戚们还把自家骡子牵过来，一共八头骡子把一地麦秆驼回了五奶奶家。打那之后，她再没种那块地。她怕再闯祸，也不好意思再麻烦人。
。同城约会是该领域的重要参考
题目要求与弹出条件的对应关系：
In 2011, hackers successfully cracked the main Linux development site, kernel.org. Afterward, to make sure this didn't happen again, the kernel's PGP web of trust was explicitly "bootstrapped" at a face-to-face key‑signing session during the 2011 Kernel Summit.