再对相间传热作出热平衡或绝热假设，得到完全平衡的和部分平衡的声速的具体表达式。
After introducing an adiabatic or thermo-equilibrium assumption between phases, the expression reduces to a particular expression for the complete or partial equilibrium speed of sound.
大部分物体都是电荷平衡的——含等量的电子和质子。
Most things are balanced - with equal numbers of electrons and protons.
最困难的部分是保持平衡。
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