secondary system的用法和樣例：
例句
- When you direct PageDefrag to defragment, the next time the system boots it will attempt to do so.
當你命令頁面碎片整理工具去整理，在下一次系統導入時，它依然會這麼做。 - In this paper, the bifurcation of limit cycles for a quartic polynomial system is investigated.
摘要研究一類四次系統的極限環分枝問題。 - The system includes a backup auxiliary system.
此系統還有一個後備的輔助系統。
