三减二是一。
三减一等于二。
Then if I change to the triple point, where the number of phases is three, then the number of degrees of freedom 2 is one minus three is minus two, two plus two is zero.
如果考虑三相点，这里有三个相，那么自由度的数目，为1减去3得负，再加上2等于零。
One plus two is three. Six minus four is two.
一加二等于三。六减四等于二。
One plus two is three. Six minus four is two.
一加二等于三。六减四等于二。
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