To give some detail, it’s /var that is writable, and mutable directories will have symbolic links pointing to subdirectories of /var:
黎海超关于三星堆的研究显示，三星堆文明的突发式崛起，建立在其与中原商王朝、长江中下游等地以及中亚与西亚发达的互动网络之上，但又形成了自身独特的风格。这种基于资源互补、技术互鉴的远距离交流网络，是中国各区域间交往的重要形式，突出体现了中华文明和而不同的包容性与协和万邦的和平底色。
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Lucy (left), now an adult, told Squire she had been praying help would come
Transplant surgeon and joint team leader Isabel Quiroga said she was "delighted" by Hugo's birth and called it a breakthrough for organ transplantation in the UK.