salutary：
释义：
adj. 有益的，有益健康的
构词：
salut=salv救助+ary……的→救助[身体]的→有益的
例句：
The team's defeat is a salutary warning before the World Cup.
这次失利是在世界杯比赛之前对整个队的`一个有益警示.
The plant proved salutary.
那植物证明是有益于人体健康的.
It was a salutary experience to be in the minority.
敌众我寡时倒是可以磨炼人。
sad：
释义：
adj. 悲哀的，令人悲痛的
例句：
It was sad to see all grandmother's lovely things being auctioned off.
眼看着祖母那些可爱的东西全都被拍卖掉,心里真不好受.
When I am sad, I take refuge in remembering happier times.
当我悲伤时, 就从回忆过去快乐的时光中寻求安慰.
When a close friend dies, we can't help but feel sad.
当一位亲密的朋友去世时, 我们不能不难过.