loss 作抽象名词,表示"丧失,损失"; 作可数名词,表示"(生意等)亏损的钱"。
The loss of his wife was a great blow to him.
Oil suffered losses in the export market.
20.prospect / prospects
prospect的单数形式,表示"景色,景象"; 其名词复数形式,表示"前景,前程,前途"。
The hill commands a fine prospect.
In recent years, the prospects of car manufacture are good.
21.production / productions
production 作"生产、制造"解时,是抽象名词;作"(文艺)作品"解时,是可数名词。
Production is at all times and under all conditions social production.
They saw several National Theatre productions.
22.product / products
product 作"商业产品总称"解时,是不可数名词;作"某事物的产物"解时,是可数名词。
We should improve the gross national product.
They are the products of post-war influence.
23.institution / institutions
institution 作"建立;任命"解时,是不可数名词;作"慈善机关,福利院;风俗,习惯"解时,是可数名词。
Wise men favor the institution of a savings bank in every big city.
Working houses, homes for poor or orphan children and asylums are institutions.
24.youth / youths
youth 作不可数名词,表示"青少年时期;青春,活力"; 作可数名词,表示"青年男子,小伙子"。
Her youth gives her an advantage over the other runners.
As a youth, he showed little promise.