人教版九年级英语-unit 4词汇讲解

1、Unit 41.million 百万 There are two million people in the city.2.medical adj.医学的，医疗的 He is a medical student. medicine n. 药物3.research n.研究，不可数名词常与do，make等连用，表示“做或进行研究工作”，其后可接介词on，in，into，for等表示研究的内容。vHe did a good deal of research on this subject.vresearch vi. “对进行研究“，后接介词intovHe is researching into t

2、he cause of cancer.4.tie n.领带 He wears a blue tie. tie v.系，拴，绑 现在分词 tying tie.to把系到上5. what if 表示询问或提建议，相当于what should I do if.? What if there is no water on the earth?辨析 what if what about what if + 句子 what about + n./v-ing6. pimple 小脓包，丘疹 get pimples 长痘，起疙瘩7. confident adj. 自信的，有把握的 be confident o

3、f sth./that.对有信心，确信 She is confident of passing the exam.=She is confident that she can pass the exam. confidence n.自信 have confidence in sth. 对某事有信心 =be confident of sth. confidently adv.自信地7. energetic adj.有活力的，精力充沛的 He is an energetic man. energy n.精力，活力 She is full of energy.8.permission n. 允许，许

4、可，准许 不可数名词 ask for permission 请求许可 with (ones) permission 经过(某人的)许可 without (ones) permission 未经(某人的)许可 He did it without permission.9. bother v.使恼怒 vt.使烦恼 + n./pron. vi. 烦恼，费心，与about/with 连用 bother with sth.为某事费心 Dont bother him!10. not.in the slightest =not at all 根本不The old lady does not feel tir

5、ed in the slightest.=The old lady does not feel tired at all.11. plenty of 很多的，后接可数名词复数或不可数名词均可，通常用于肯定句或否定句中。疑问句中则用enough,much或many. Is there enough money? a number of+可数名词复数12. let sb.down 让某人失望/沮丧 Please dont let me down.13. come up with 想出，提出=think of He comes up with a good idea.14. rest n.其余 th

6、e rest 做主语时，若代替可数名词复数，谓语用复数，若代替不可数名词，谓语用单三。In our class,some students are drawing and the rest are reading.There is 10 yuan in the wallet.Four yuan is for you,and the rest is for me. the rest of +n.做主语，谓语动词的数应与of后的名词的数保持一致。The rest of the workers are from countryside.The rest of the food has gone bad.15. come out 出版，发表This magazine comes out once a week.开花I think the rose will come out next e短语大聚会come back回来 come from来自come over顺便来访 come across 偶然遇到 16. coverwith用盖住 Dont cover his face with the book. cover作名词，意为“盖子，封面”I really like the cov