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On Instagram you’re more likely to find #bookstagram, which has 124 million posts, but you’ll also find 11 million posts on the app under #booktok. On Reddit, r/Booktokreddit has 47,000 users visiting the subreddit every week.，详情可参考PDF资料
«Решетнев» рассказал о сборке спутника «Ямал-501»14:53，这一点在PDF资料中也有详细论述
- `(_*a_*)&~(_*b_*)` = any string that contains 'a' AND does not contain 'b'