Built-in plagiarism checker
春节假期全国铁路发送旅客 1.21 亿人次，创历史新高
，更多细节参见safew官方版本下载
A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.
Cyrillic homoglyphs: the real threat
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