知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 In 1951, the British Board of Film Censors launched the X certification to indicate a movie was "really graphic." Although this at first referred to violence and terrible language and also sexual intercourse, "X-rated" was co-opted from the porn industry which is now shorthand for sexually https://coingenius.news/ethereum-2-0-off-track-phase-0-most-likely-to-release-in-2021/