【人教课标选修9】Unit 2 Sailing the oceans

be starved of vt 缺乏……欠缺……

2> gradually :    adj not suddenly

    gradual :    adj happening slowly

eg : a gradual increase in population

Her health is gradually improving

3> tear : vt/vi 撕裂扯破

tear sth

sth from /off /out of… …

adv (away off out up down 连用)

phr  tear apart 拆散、使分离

tear at 用力扯

tear down 扯下、撕毁

tear into 攻击某人、指责

tear off 扯掉、撕掉

tear oneself away from 忍痛离开、分离

tear up 撕裂、撕毁（合同）

4> extreme : adj 1在尽头的

eg : the extreme borders of a country

Stand at the extreme edge of the bank

2.极度的、最大的、极端的

an extreme case

be in extreme danger

3.极严厉的、猛烈的

take extreme measures

n. 极端、极端的、措施、手段等

be forced to an unpleasant extreme .

5> thirst :n. 口渴、渴望

a thirst for knowledge

vi 口渴、渴望

     thirst for 渴望某物

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