質量保存は物理学の原理であり、孤立した系の質量は時間の経過によって一定であるということを述べています。
The conservation of mass is a principle in physics that states that the mass of an isolated system remains constant over time.
The teacher used a science experiment as an object lesson to explain the concept of gravity.
Confidential documents should be stored in locked cabinets at all times.
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