But good husbands take their wives at their word.

这句话应当翻为：但好丈夫都会对他们的夫人言听计从。

you can't take them at their word. You've got to take a look at their performance,(不要只相信他们说的,要看他们所做的.)

Take someone at their word：相信某人说的话

But good husbands take their wives at their word.

但好丈夫总是相信他们的太太说的话.

但是好男人(好丈夫)会以他们的实际行动来证明