21. enrich vt.1. Improve改善:改进 t is important to enrich the soil before planting种植前先改良土壤是很重要的。 2. make rich or richer丰富 An education enriches your mind.教育可以丰富你的思想。 rV enriches life in some ways.电视在某些方面丰富了生活 22. yield v.1. gIve up;quit屈服;放弃 He yields to temptation easily.他很容易受诱惑 2. produce出产;生长于 This research has been in progress since 1978 and has yielded many positive results.这项研究 自1978年以来一直在进行,并已取得了许多实际成果 This piece of land yielded a crop worth$00,000 last year.这块地去年长出的庄稼值50万美 lI Expressions 1. either.or., no middle point 2. to sell out to convenience 3. to be in short supply 4. the bottom line 5. to consist of three key principles 6. to stand firmly for the convictions to be on the medical team 8. to account for the surgical instruments 9. to think of the patient 10. to give others credit that is rightfully theirs 11. to clarify the point 12. to feel good about oneself 13. to engage in a personal cover-up of areas 14. to yield to the tempting attractions 16. without having to check your tracks in a rear-view mirror 1. either;or… no middle point 1.要么……要么…没有折中办法(L.1) We had to either fight to the end or wait for our death. There was no middle poin 我们要么战斗到底,要么坐以待毙,没有折中的办法 2. to sell out to convenience为贪图舒适而背叛立场(L.6) We hate those whose principles sell out to a variety of attractions 我们憎恨那些经不起各种诱惑而出卖原则的人 to be in short supply供应不足(L.8) Qualified English teachers are in short supply in the broad areas of the countryside 目前广大的农村地区缺乏合格的英语老师 4. the bottom line关键所在(L.9 The bottom line of overcoming the spread of this infectious disease is to find out both its cause and its vehicle as soon as possible 抑制这种传染性疾病蔓延的关键是尽快找到病因及传染媒介 to consist of three key principles由三个重要原则构成(L.10)21. enrich vt. 1. improve 改善；改进 It is important to enrich the soil before planting. 种植前先改良土壤是很重要的。 2. make rich or richer 丰富 An education enriches your mind. 教育可以丰富你的思想。 TV enriches life in some ways. 电视在某些方面丰富了生活。 22. yield v. 1. give up; quit 屈服；放弃 He yields to temptation easily. 他很容易受诱惑。 2. produce 出产；生长于 This research has been in progress since 1978 and has yielded many positive results. 这项研究 自 1978 年以来一直在进行，并已取得了许多实际成果。 This piece of land yielded a crop worth $500,000 last year. 这块地去年长出的庄稼值 50 万美 元。 II Expressions 1. either…or…, no middle point 2. to sell out to convenience 3. to be in short supply 4. the bottom line 5. to consist of three key principles 6. to stand firmly for the convictions 7. to be on the medical team 8. to account for the surgical instruments 9. to think of the patient 10. to give others credit that is rightfully theirs 11. to clarify the point 12. to feel good about oneself 13. to engage in a personal cover-up of areas 14. to yield to the tempting attractions 15. to win the day 16. without having to check your tracks in a rear-view mirror 1. either…or…, no middle point 1.要么……要么…….没有折中办法(L. 1) We had to either fight to the end or wait for our death. There was no middle point. 我们要么战斗到底，要么坐以待毙，没有折中的办法。 2. to sell out to convenience 为贪图舒适而背叛立场 (L. 6) We hate those whose principles sell out to a variety of attractions. 我们憎恨那些经不起各种诱惑而出卖原则的人。 3. to be in short supply 供应不足 (L. 8) Qualified English teachers are in short supply in the broad areas of the countryside. 目前广大的农村地区缺乏合格的英语老师。 4. the bottom line 关键所在 (L. 9) The bottom line of overcoming the spread of this infectious disease is to find out both its cause and its vehicle as soon as possible. 抑制这种传染性疾病蔓延的关键是尽快找到病因及传染媒介。 5. to consist of three key principles 由三个重要原则构成 (L. 10)