You'd have to be sad to wear a shirt like that.
你穿着那样的衬衣显得老气。
I was very sad indeed to hear of your father's death.
听到令尊大人去世，我感到非常难过。
How sad that all his hard work should come to nothing.
他的所有辛勤劳动竟全部付诸东流，太让人伤心了。
The increase in crime is a sad reflection on our society today.
犯罪的增加令人遗憾地反映了当今社会不太好的一面。
It's a sad fact that many of those killed were children.
让人难以接受的是遇难者中很多是孩子。
It was sad to see them go.
看着他们离去，真让人难过。