영어 문장 해석 부탁드려요

아래 문장들 해석 부탁드려요.
1. Family who nourish their children with words as well as food at dinner time produce better future reader.
2. The researchers point out that children can learn from eight to twenty new words a day, so they need to be fed new words.
3. These feathers are called down and are found underneath other feathers.
4. To have a great work in progress is the way to live long.
마지막 문장은 ‘진행 중인 일에서 큰 성과를 얻는 것이 오래 사는 방법’이라는 뜻인가요?