流利说 D64 2018-08-30
一、复习
Level4-Unit1-Part3*Learning-
- Listening-Harry's Trips 1"+2 D62 2018-08-28
二、复习
Level4-Unit1-Part3*Learning-
- Listening-Harry's Trips 2"+1 D63 2018-08-29
三、学习
Level4-Unit1-Part3*Learning-
- Vocabulary-Dental Problems"+3
1、An X-ray shows what can't be seen on the surface of teeth and gums.
2、A cracked tooth can be caused by biting down on something hard.
- inject v.注入、注射
- process v.处理、提炼///n.过程、加工
- extraction n.萃取、抽取（物）、拔出
- block v.阻塞、阻止///n.块、分段
3、Dentists often inject something into the gum block
the pain during the extraction process.
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crook adj 弯曲的、瞎的、钩状的///v.弯曲///n.钩、恶棍
4、Braces are used on people with crooked teeth or after an injury.
- cavity n.腔，洞;蛀牙，龋洞
- dental 牙齿
- bacteria 菌
- frequently adv.经常地、频繁地
- regularly adv.经常地
- prevent v.预防、避免、抵制、警告
＠A dental cavity is a hole in the tooth. ＠A cavity is caused by bacteria in the mouth. @Brushing your teeth frequently and regularly can help prevent cavities.
- cracked adj.有裂缝的;声音沙哑的;精神失常的///v.破裂;崩溃(crack的过去分词);发沙哑声
- bite v.咬、叮、噬、龈、蛰///n.咬伤
- dentist 牙医
- treat v.对待、治疗、看成///n.享乐、愉快
- crown n.王冠;花冠（有时象征胜利）;王权;（某物的）顶部 ///vi.露顶///vt.（尤指通过增添成就、成功等）使圆满;为…加冕;使圆满完成;给…以荣誉
@A cracked tooth can be caused by biting down on something hard.[一些坚硬的咬伤可能会引起牙齿裂开] @Dentists treat cracked tooth by covering it with a crown(牙冠).
- gum n.胶、牙床///v.粘上、贴好
@A dental X-ray is a picture of your teeth and gums. @An X-ray shows what can’t be seen on the surface of the teeth and gums.
- Brace vt.支撑;系紧;准备，预备;振作起来 ///vi.准备好;支持;打起精神///n.支持物;铁钳，夹子;[语]大括号;绷紧（身体部位的）肌肉
- Straighten vt.& vi.变直，把…弄直;整理，整顿;使…改正;使…好转///vi.变好起来
- crook n.骗子;弯曲;钩;诡计 ///vt.使成钩状;使弯曲 ///vi.弯曲 ///adj.不正当的;骗人的-
- crooked adj.弯曲的;不正当的;歪扭的;用不正当手段得来的
Braces are used by dentists to straighten teeth over a period of years. Those braces are usually for children, they can also be used for adults with crooked teeth.
- extract v.提取、摘录、拔出、开采///n.拔、浸膏
- pull v.拉、拔、划、牵线、扯///n.张力、靠山、拉力
@To extract a tooth means to remove it from the mouth. Dentists have to pull hard to extract a tooth.[牙医必须用力拉才能拔出牙齿]
