所以Tds就是。
In other words, t surrounding ds has to be greater than zero, and of course temperature is always positive.
换句话说这就意味着，环境温度T乘以dS必须大于零，当然环境温度t是正的。
If it's a reversible process then the equality holds, but if it's irreversible, which means it happens spontaneously, t then ds is greater than this.
对于可逆过程，等号成立，但是如果是不可逆过程，这些不可逆过程是自发进行的，那么dS大于dq除以。
We saw that in general dS is greater than T or equal to dq over T.
我们发现一般来说dS大于,或者等于dq除以。
Or we can rewrite this as du dV minus t surroundings dS is less than zero.
或者我们可以写为，加上压强p,du, plus, external, pressure，乘以dV减去环境温度T乘以dS小于零。
Or we can rewrite this as du dV minus t surroundings dS is less than zero.
或者我们可以写为，加上压强p,du, plus, external, pressure，乘以dV减去环境温度T乘以dS小于零。
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