sad是什么意思？

As much as we would like to cling on to our past, even the saddest moments can be washed away with time.

One day, when he went to get his 7-year-old son from soccer practice, his kid greeted him with a downcast face and a sad voice.

Nearly every business has a sad tale to tell.

Saddest of all is when children catch a glimpse of the masked fire fighter but hide because they think they have seen a monster.

And then they change the mood in the music either from sad to happy or the other way around.

It's likely you prefer to feel happy instead of sad or confident instead of insecure.

This suggests that babies of that age can tell the difference between a happy melody and a sad tune.