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.

例如，从瑞士到西班牙乘飞机需要两小时，而乘火车大约需要一天。

For example, it takes two hours by plane from Switzerland to Spain, ___whereas it takes approximately one day by train.

我喜欢茶，而我弟弟喜欢咖啡。

I prefer tea, ___whereas my brother prefers coffee.