The act of keeping from decay, loss, or injury. 保护；保存。 Official care and preservation of natural resources. 官方对自然资源的保护。 conservation of angular momentum 【理】角动量守恒。 conservation of baryons 【理】重子守恒。 conservation of charge 【理】电荷守恒。 conservation of leptons 【理】轻子守恒。 the conservation of energy 能量不减。 the conservation of mass 质量不减。 the conservation of matter 质量不减。 |