It was this exploring around problems and his dynamic⑭ spirit that⑮ led to his most famous invention - the telephone in 1876. Bell never set out to⑯ invent the telephone and what he was trying to design⑰ was a multiple⑱ telegraph. This original telegraph sent a message over distances using Morse code⑲ (a series of dots⑳ tapped\s\up1(21(21) out along a wire\s\up1(22(22) in a particular order). But only one message could go at a time\s\up1(23(23). Bell wanted to improve it so that\s\up1(24(24) it could send several messages at the same time. He designed a machine that would separate\s\up1(25(25) different sound waves and allow different conversations to be held at the same time. But he found the problem difficult to solve\s\up1(26(26). One day as he was experimenting with\s\up1(27(27) one end of a straw\s\up1(28(28) joined to a deaf man's ear drum\s\up1(29(29) and the other to a piece of smoked glass, Bell noticed that when he spoke into the ear, the straw drew sound waves on the glass. Suddenly he had a flash of inspiration\s\up1(30(30). If sound waves could be reproduced\s\up1(31(31) in a moving electrical current\s\up1(32(32)， they could be sent along a wire. In searching to improve the telegraph, Bell had invented the first telephone！ 　　⑭dynamic/daI'næmIk/adj.充满活力的；精力充沛的；动态的；发展变化的

　　⑮It was ...that ...是强调句型，此处强调了句子主语this exploring和spirit。

　　⑯set out (to do)开始(做)

　　⑰what he was trying to design是what引导的主语从句。

　　⑱multiple/'mʌltIpl/adj.多种的；多样的；多类型的 n．倍数

　　⑲Morse/mɔːs/code莫尔斯电码

　　⑳dot/dɒt/n.点；小圆点 vt.以小圆点标出；分散

　　\s\up1(21(21)tap/tæp/vt.& vi.轻打；轻拍；轻敲 n．轻轻地敲击(声)；(水)龙头

　　\s\up1(22(22)wire/'waIə/n.金属丝；电线　\s\up1(23(23)at a time一次

　　\s\up1(24(24)so that引导目的状语从句。

　　\s\up1(25(25)that would separate ...是that引导的定语从句，对a machine加以修饰和限制。

　　\s\up1(26(26)difficult to solve是形容词短语作后置定语，相当于定语从句that which is difficult to solve。to solve是动词不定式，用主动形式表达被动意义。

　　\s\up1(27(27)experiment with用/对......做实验；试用

　　\s\up1(28(28)straw/strɔː/n.稻草；麦秆；饮料吸管

　　\s\up1(29(29)过去分词短语joined to a deaf man's ear drum作定语。

　　\s\up1(30(30)a flash of inspiration灵机一动

　　\s\up1(31(31)reproduce/ˌriːprə'djuːs/vt.复制；再现......的形象或声音

　　\s\up1(32(32)current/'kʌrənt/n.(水或气)流；电流 adj.现在的；当前的

　　 　　[第3段译文]　　

　　正是这种对问题的探索和富有活力的精神造就了他那最著名的发明--1876年的电话的。贝尔并非一开始就想要发明电话的，他本来想设计的东西是多路电报。这种原始的电报用莫尔斯电码长距离传送信息莫尔斯电码是通过电线发出的以特定的次序敲击出的一连串点、划。但是这样一次只能发一个信息。贝尔想改进电报通讯方式，以便同时能发出好几个信息。他设计了一种机器，以使声波分成不同的音调，从而有可能在同一时间里进行不同的通话。但是他发现这个问题很难解决。有一天做实验，他把一根干草的一端和一个耳聋的人的耳鼓膜连接起来，另一端连接了一块被烟熏过的玻璃。贝尔发现，当他对着耳朵说话的时候，这根干草就把声波画在玻璃上。突然间他灵机一动，灵感来了。如果声波能够以连续运动的电流形式复制的话，那么声波就可以沿着导线传送出去了。在探求改进电报的过程中，贝尔发明了第一台电话机！

　　　　Bell was fully aware of\s\up1(33(33) the importance of his invention and wrote to his father：

　　"The day is coming when telegraph wires will be laid on to houses just like water or gas\s\up1(34(34) - and friends will talk to each other without leaving home."

　　The patent was given in 1876, but it was not until five days later that\s\up1(35(35) Bell sent his first telephone message to his assistant Watson. The words have now become famous：

　　"Mr Watson - come here - I want to see you."

　　Alexander Graham Bell was not a man to rest and he interested\s\up1(36(36) himself in many other areas of invention. He experimented with helicopter\s\up1(37(37) designs and flying machines. While searching for a kite\s\up1(38(38) strong enough to carry a man into the air, Bell experimented putting triangles\s\up1(39(39) together and discovered the tetrahedron\s\up1(40(40) shape. Being very stable\s\up1(41(41)， it has proved invaluable\s\up1(42(42) in the design of bridges.

　　Bell was an inventor all his life. He made his first invention at eleven and his last at seventy­five. Although he is most often associated\s\up1(43(43) with the invention of the telephone\s\up1(44(44)， he was indeed a continuing\s\up1(45(45) searcher after practical\s\up1(46(46) solutions to improve the quality of everybody's life.

　　\s\up1(33(33)be aware of意识到

　　\s\up1(34(34)when引导定语从句，修饰the day。is coming是现在进行时表将来。

　　\s\up1(35(35)it was not until five days later that ...是强调句型，强调时间状语not until five days later。

　　\s\up1(36(36)interest sb./oneself in使某人/自己对某事、某物感兴趣

　　\s\up1(37(37)helicopter/'helIkɒptə/n.直升飞机

　　\s\up1(38(38)While searching for a kite ...是时间状语从句的省略形式，补充完整为：While he was searching for a kite ...

　　\s\up1(39(39)triangle/'traIæŋɡl/ n．三角形；三角形物体

　　\s\up1(40(40)tetrahedron/ˌtetrə'hiːdrn/n.四面体

　　\s\up1(41(41)stable/'steIbl/adj.稳固的；稳定的；安定的

　　\s\up1(42(42)invaluable/In'væljʊəbl/adj.无价的；极宝贵的

　　\s\up1(43(43)associate/ə'səʊʃIeIt/vt.联想；联系 /ə'səʊʃIət/n.同伴；伙伴

　　\s\up1(44(44)Although引导让步状语从句。

　　\s\up1(45(45)continuing是现在分词作定语，意为"持续的；永不停息的"。

　　\s\up1(46(46)practical/'præktIkl/adj.实际的；实践的；实用的