Chapter Three Communications Channel Unit 10 a part 1 Notes to Text L Part4 Extensive Reading Part 2 Word Study Part5 Notes to Passage Part3 Practice on Text Part6 Practice on Passage 2021/2/20 P1
2021/2/20 P.1 Unit 10 Communications Channel Chapter Three @ Part 1 Notes to Text & Part4 Extensive Reading & Part 2 Word Study @ Part5 Notes to Passage @ Part3 Practice on Text @ Part6 Practice on Passage
a Part 1 Notes to text Communications Channel 1) It may be defined by a physical wire that connects communicating devices, or by a radio, laser, or other radiated energy source that has no obvious physical presence连接通讯设备的物理导线、无线电波、激光或其它那 些无形的辐射能源,都可说成是信道。 注释:该句是复合句,主语指代 a communications channel;谓 语是 may be defined;其状语由两个并列的介词短语构成,分别 REby a physical wire, a radio, laser, M by other radiated energy source;定语从句 Ithat connects communicating devices]bfpa physical wire; that has no obvious physical presence则修饰 other radiated energy source。 2021/2/20 P2
2021/2/20 P.2 @ Part 1 Notes to Text 1) It may be defined by a physical wire that connects communicating devices, or by a radio, laser, or other radiated energy source that has no obvious physical presence. 连接通讯设备的物理导线、无线电波、激光或其它那 些无形的辐射能源，都可说成是信道。 注释：该句是复合句，主语it指代a communications channel；谓 语是may be defined; 其状语由两个并列的介词短语构成，分别 是by a physical wire，a radio, laser, 和by other radiated energy source；定语从句that connects communicating devices修饰a physical wire；that has no obvious physical presence则修饰other radiated energy source。 Communications Channel
2). Information sent through a communications channel has a source from which the information originates, and a destination to which the information is delivered.通过信道发送的信息都有 个信息源和送达的目的地。 注释:该句中的 sent through a communications channel是过去分 词短语作定语,修饰主语 information; from which the information originates和 to which the information is delivered是介词前置的定 语从句,分别修饰两个宾语: a source和 a destination 2021/2/20 P3
2021/2/20 P.3 2）Information sent through a communications channel has a source from which the information originates, and a destination to which the information is delivered. 通过信道发送的信息都有一 个信息源和送达的目的地。 注释：该句中的sent through a communications channel是过去分 词短语作定语，修饰主语information; from which the information originates和to which the information is delivered是介词前置的定 语从句，分别修饰两个宾语：a source 和a destination
3) Although information originates from a single source, there may be more than one destination, depending upon how many receive stations are linked to the channel and how much energy the transmitted signal possesses.虽然信息产生于一个信息源,但 送达的目的地却可能不止一个,这往往取决于连接信道接收站的数量 和已发送信号所拥有的能量高低。 注释:连词 Although引导的是让步状语从句;该句的主句是 ethere may be more than one destination;其中短语 more than表示“不 止”,“多于”;现在分词短语用作伴随状语,介词upon的宾语是由 how many和 how much引导的宾语从句构成的。 4) It really consists of two sim plex channels, a forward channel and a reverse channel, inking the same points.其实全双工通道是 由两条单工信道构成的,其中一条是正向通道,一条是反向通道,它 们的连接点相同。 注释:主语此指代“全双工通道”;名词短语 a forward channel and a reverse channel是宾语 two simplex channels的同位语;现在分词 短语 lin king the same points是伴随状语 2021/2/20 SPaY End
2021/2/20 P.4 3）Although information originates from a single source, there may be more than one destination, depending upon how many receive stations are linked to the channel and how much energy the transmitted signal possesses. 虽然信息产生于一个信息源，但 送达的目的地却可能不止一个，这往往取决于连接信道接收站的数量 和已发送信号所拥有的能量高低。 注释：连词Although引导的是让步状语从句；该句的主句是there may be more than one destination；其中短语more than表示“不 止”，“多于”；现在分词短语用作伴随状语，介词upon的宾语是由 how many 和how much引导的宾语从句构成的。 4）It really consists of two simplex channels, a forward channel and a reverse channel, linking the same points. 其实全双工通道是 由两条单工信道构成的，其中一条是正向通道，一条是反向通道，它 们的连接点相同。 注释：主语It指代“全双工通道”；名词短语a forward channel and a reverse channel是宾语two simplex channels的同位语；现在分词 短语linking the same points是伴随状语。 End
Part 2 Word Study 1. channel n.信道 10 multibit n.多数据位 2. pathway n.路径;通道 1 .encapsulation n.压缩;包装 3. wire n.导线 12 acilitate v.使容易,使便利 4 laser n.激光 13. duplex adj,双工的 5. radiate v.辐射 14. simultaneously adv.同时地 6. presence n.存在 15 garbled adi.混乱的,引起误解的 7. originate v.起源;发端 16 .simplex adj.单工的 8. possess V.拥有 17 half-duplex adj半双工的 9 encapsulate v.压缩;打包 18. full-duplex adj全双工的 2021/2/20 P.5 End
2021/2/20 P.5 End 1. channel n. 信道 2. pathway n. 路径；通道 10.multibit n. 多数据位 11.encapsulation n. 压缩;包装 3. wire n. 导线 12.facilitate v. 使容易, 使便利 4.laser n. 激光 13.duplex adj. 双工的 5. radiate v. 辐射 14.simultaneously adv. 同时地 6. presence n. 存在 15.garbled adj. 混乱的，引起误解的 7. originate v. 起源；发端 16.simplex adj. 单工的 8. possess v. 拥有 17.half-duplex adj. 半双工的 9. encapsulate v. 压缩；打包 18.full-duplex adj. 全双工的 & Part 2 Word Study