单词：conservation of particles
conservation of particles的用法和样例：
例句
- The conservation of energy does not require that a system be isolated.能量的守恒并不要求系统必须是孤立的。
- The conservation of angular momentum explains why disks are so prevalent in the universe.角动量的守恒解释了为什麽圆盘在宇宙中这麽普遍。
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