whereas

我喜欢茶，而我弟弟喜欢咖啡。

I prefer tea, ___whereas my brother prefers coffee.

他一定大约六十岁，而他的妻子看起来大约三十岁。

He must be about sixty, ___whereas his wife looks about thirty.

我父亲五十多岁，而我母亲四十多岁。

My father is in his fifties, ___whereas my mother is in her forties.