You are strongly recommended to take a backup of your system before majorinstallation and backups at regular intervals.
强烈推荐你在重大的安装前备份系统，并且做到定期备份。
2
These are mainly add-on products, rather than modifications that require majorinstallation work, and they include fuel catalysts, air filters, air intakes, and power chips.
这些主要是附加产品，而不是需要修改，主要安装工作，包括燃料催化剂、空气过滤器、空气摄入，芯片。
3
The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life span.