Translation of "Faithful" in Chinese

I'm faithful to my wife.

我忠于我的妻子。

Translation is like a woman. If it is beautiful, it is not faithful. If it is faithful, it is most certainly not beautiful.

翻译就像一个女人。她漂亮就会不忠诚；她忠诚就肯定不会漂亮。

The statue of Hachiko, the faithful dog, stands in front of Shibuya Station.

忠犬八公的雕像伫立在涩谷站前。

The slowest one to make a promise is the most faithful one in keeping it.

最慢的承诺永远是最忠实的信用。

The feelings of "love at first sight" and "faithful unto death" are unrealistic; this sort of unrealistic and illusory feeling is not what we need.

「一見鍾情」以及「從一而終」的感情是不切實際的，我們需要的不是這種不切實際而虛幻的感情。