To give some detail, it’s /var that is writable, and mutable directories will have symbolic links pointing to subdirectories of /var:
Save to wishlistSave to wishlist，这一点在爱思助手下载最新版本中也有详细论述
Topkit_Up1982пользователь Reddit，更多细节参见91视频
Раскрыты подробности похищения ребенка в Смоленске09:27