salutary：
釋義：
adj. 有益的，有益健康的
構詞：
salut=salv救助+ary……的→救助[身體]的→有益的
例句：
The team's defeat is a salutary warning before the World Cup.
這次失利是在世界杯比賽之前對整個隊的一個有益警示.
The plant proved salutary.
那植物證明是有益于人體健康的.
It was a salutary experience to be in the minority.
敵眾我寡時倒是可以磨煉人。
sad：
釋義：
adj. 悲哀的，令人悲痛的
例句：
It was sad to see all grandmother's lovely things being auctioned off.
眼看著祖母那些可愛的東西全都被拍賣掉,心里真不好受.
When I am sad, I take refuge in remembering happier times.
當我悲傷時, 就從回憶過去快樂的時光中尋求安慰.
When a close friend dies, we can't help but feel sad.
當一位親密的朋友去世時, 我們不能不難過.