Do not use normal legible words to name internal variables.
不要使用普通易读的词语命名内部变量。
Internal validity - is there true cause and effect between variables.
内部有效性——在条件变化的时候，其成因和结果还会是真实的么？
The internal energy is related to other variables through the equations of state.
借助状态方程，内能和其它变量发生关系。
The internal energy is related to other variables through the equations of state.
借助状态方程，内能和其它变量发生关系。
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