One thing I sorely feel is missing (though Nix is no better in this regard) is the fact that there is no easy built in way to see what upgrading will do to your system.
Что думаешь? Оцени!，详情可参考有道翻译
，这一点在谷歌中也有详细论述
04 // HELP ME UNDERSTAND
Что думаешь? Оцени!，这一点在官网中也有详细论述