Unit 11 Turn it down! Lesson 21（课件）-2024-2025学年新概念英语青少版 3A

Unit 11 Turn it down! Lesson 21 New words continuous decibel unlucky interrupt for ever limit damage level sudden experience deaf Text 凯西英语 你对分贝了解多少？ 分贝（decibel）dB 分贝是以美国发明家亚历山大·格雷厄姆·贝尔（英国人，后移居美国）命名的，他因发明电话（1875年贝尔制成了实用的电话装置，1876年建起了世界上第一家电话公司。）而闻名于世。 你知道一个声音与另一个声音结合时，会产生什么结果吗？我们都知道60个苹果加60 个苹果，等于120个苹果。但是，这并不适用于以分贝来表示的声音。事实上，60分贝加60分贝只等于63分贝。 分贝对人的影响有什么？ ★ 10~20分贝几乎感觉不到。 　　 ★ 20~40分贝相当于轻声说话。 　　 ★ 40~60分贝相当于室内谈话。 　　 ★ 60~70分贝有损神经。 你对分贝了解多少？ 　★ 70~90分贝很吵。长期在这种环境下学习和生活，会使人的神经细胞逐渐受到破坏。 　　 ★ 90~100分贝会使听力受损。 　　 ★ 100~120分贝使人难以忍受，几分钟就可暂时致聋。 　　 一般声音在30分贝左右时，不会影响正常的生活和休息。 而达到50分贝以上时，人们有较大的感觉，很难入睡。 维塔斯的高音是105分贝，而飞机起飞时螺旋桨发出的声音才110分贝！ Lucy: Dad, that music’s loud!Turn it down! William: Sorry, Lucy! Am I interrupting your homework? Lucy: It’s not that, Dad. We had a lesson today about hearing.Look at this. Unit 11 Turn it down! Notes on the Text interrupt v. 打断 interrupt sth. =sth is interrupted by… e.g: He tried to speak, but she interrupted him. 他尝试着去说出来，但是她打断了他。 不要打扰我。 Don't interrupt me! interrupt 是打断的意思，主要打断别人正在进行的事情，如谈话，或者工作。 disturb是打扰的意思，主要是打扰别人休息。 bother是烦扰的意思，主要是指在某一时间段里，持续打扰别人并使别人烦恼。 interrupt & interruption n. One person in seven in the UK is deaf, and many of them are deaf because of noise. For most people, the safe limit is 85 decibels(dB) for continuous noise, and 103 dB for sudden noise. After fifteen minutes at 105 dB, most people will have some damage to their hearing. because of，of为介词，后跟名词。 e.g: I'm here because of you. because conj. 其后接原因状语从句或回答以why开头的问句； e.g: Because he is ill, he is absent today. Notes on the Text damage n&v 损坏，伤害 1. v. damage sth. 损坏某物 2.n. (可数) have some damage to sb./sth. 对某物或某人有伤害 Music in nightclubs is often much louder than the safe limit.19% of young people listen to their MP3 players at 105 to 110 dB for many hours. 75% of them will experience ‘ringing in the ears’,and they will feel a bit deaf. If they are lucky, this will last for one or two days. If they are unlucky, the damage will last for ever. much louder, 通常用much修饰形容词或副词的比较级，表示"...得多"。 类似的词还有 a bit，a little，rather，far，even experience experience n.经验，（不可数名词）；经历（可数） vt.亲身参与，亲身经历；感受；发现 e.g. We had never experienced this kind of holiday before . （动词） Lucy: You’re always listening to loud music, Dad. If you aren’t careful, you’ll become deaf. William: Sorry, Lucy! What did you say? Lucy: Oh, Dad! It isn’t funny! William: Of course it isn't. And I will turn the sound down. I promise! promise （v. 允诺，许诺） (1) promise to do sth e.g: He promised to help us. (2) promise sb. sth.=promise sth to sb. 承诺给某人某物 e.g. I can't give you the book because I've promised it to Susan. n. 许诺；希望，指望；允诺的东西 make a promise $$