second order 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(yè)面碎片整理工具去整理，在下一次系統導入時(shí)，它依然會(huì )這么做。 - In this paper, the bifurcation of limit cycles for a quartic polynomial system is investigated.
摘要研究一類(lèi)四次系統的極限環(huán)分枝問(wèn)題。
