{
  boot.loader.grub = {
    enable = true;
    device = "/dev/sda";
    useOSProber = true;
  };

  networking.networkmanager.enable = true;

  time.timeZone = "Asia/Shanghai";
  i18n.defaultLocale = "zh_CN.UTF-8";
  i18n.extraLocaleSettings = {
    LC_ADDRESS = "zh_CN.UTF-8";
    LC_IDENTIFICATION = "zh_CN.UTF-8";
    LC_MEASUREMENT = "zh_CN.UTF-8";
    LC_MONETARY = "zh_CN.UTF-8";
    LC_NAME = "zh_CN.UTF-8";
    LC_NUMERIC = "zh_CN.UTF-8";
    LC_PAPER = "zh_CN.UTF-8";
    LC_TELEPHONE = "zh_CN.UTF-8";
    LC_TIME = "zh_CN.UTF-8";
  };
  services.xserver.xkb.layout = "cn";

  users.users.luochen570 = {
    isNormalUser = true;
    description = "luochen570";
    extraGroups = [
      "networkmanager"
      "wheel"
    ];
  };
}