2021年2月，“十四五”刚开局，习近平总书记来到贵州考察，走进苗族村民家，走进扶贫车间，了解发展特色苗绣产业，亲切地对乡亲们说，“全面建设社会主义现代化，一个民族也不能落下”。
The complexity of determining the minimum number of flips that transform one triangulation of a convex point set into another remained a tantalizing open question for many decades. We settle this question by proving that computing shortest flip sequences between triangulations of convex polygons, and therefore also computing the rotation distance of binary trees, is NP-hard.
，这一点在clash下载中也有详细论述
Do you think the leadership would not be able to justify dropping their promises, when they really need to come up with a strong justification?
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