Innovations in recent years to make testing methods more sophisticated include thermal imaging, light analysis using lasers, and DNA profiling.
There are several ways a subreddit can be manipulated. "Brigading" involves a coordinated attack by social media users on another group. In Reddit that would be a group of users looking to manipulate the conversation or voting pattern on a subreddit.
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paper card, often the same dimensions as a modern credit card, but with punched
刘年丰：不太行，主要有两层理由。
// 从左找第一个大于pivot的