北师大版高中英语模块7--Unit 20 lessons3-3
教程:北师大版高中英语模块7(选修)  浏览:591  
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    [00:01.70]A few years later, penicillin was being mass-

    [00:04.38]produced and helping to save the lives

    [00:06.82]of millions.

    [00:08.31]Despite the incredible outcome of his discovery

    [00:11.08]Fleming remained modest.

    [00:13.06]"Nature makes penicillin," he said,

    [00:15.34]" I just found it."

    [00:17.57]During the Second World War,

    [00:19.26]when penicillin was first being used,

    [00:21.48]the US Navy wre looking for ways

    [00:23.19]of improving the accuracy of their missiles,

    [00:25.98]but this was very complex.

    [00:28.17]The navy turned to Eckert,

    [00:30.38]an engineer, and Mauchly, a physicist,

    [00:33.54]to produce a machine to do the job.

    [00:36.08]Although they and their team did not finish

    [00:38.21]the machine until after the war,

    [00:40.42]in February 1946, it did not matter.

    [00:43.49]This huge machine

    [00:45.35]was the world's first computer.

    [00:47.51]But it was nothing like our computers today.

    [00:50.27]It measured 100 feet long by over 10 feet high

    [00:53.57]and weighed over 30 tonnes.

    [00:56.02]And with 18,000 tubes and 6,000 switches,

    [00:59.49]it used so much energy

    [01:01.14]that when it was turned on,

    [01:02.83]the lights in the local town went out!

    [01:04.43]

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