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。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。b : extensive-recognized observe regarded as unwritten law c : repeated follow Custom helps make all items simple.#banner #flag #flag definition #fl