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    Boeing has revealed that it has retrofitted retired1 fighter jets to turn them into drones.
    Gulf2 of Mexico on the test carried out on 19 September一架退役F16战机翻新改造为无人机

    The pilotless jet flew over the Gulf of Mexico on the test carried out on 19 September
    It said that one of the Lockheed Martin F-16 made a first flight with an empty cockpit last week.   Two US Air Force pilots controlled the plane from the ground as it flew from a Florida base to the Gulf of Mexico.   Boeing suggested that the innovation could ultimately be used to help train pilots, providing an adversary3 they could practise firing on.   The jet - which had previously4 sat mothballed at an Arizona site for 15 years - flew at an altitude of 40,000ft (12.2km) and a speed of Mach 1.47 (1,119mph/1,800km/h).   It carried out a series of manoeuvres including a barrel roll and a "split S" - a move in which the aircraft turns upside down before making a half loop so that it flies the right-way-up in the opposite direction. This can be used in netbat to evade5 missile lock-ons.   Boeing said the unmanned F16 was followed by two chase planes to ensure it stayed in sight, and also contained equipment that would have allowed it to self-destruct if necessary.   The firm added that the flight attained6 7Gs of acceleration7 but was capable of carrying out manoeuvres at 9Gs - something that might cause physical problems for a pilot.    "It flew great, everything worked great, [it] made a beautiful landing - probably one of the best landings I've ever seen," said Paul Cejas, the project's chief engineer.   Lt Col Ryan Inman, Commander of the US Air Force's 82nd Aerial Targets Squadron, also had praise for how the test had gone.   "It was a little different to see it without anyone in it, but it was a great flight all the way around," he said.
    1 retired      adj.隐退的,退休的,退役的 参考例句:
    The old man retired to the country for rest.这位老人下乡休息去了。
    Many retired people take up gardening as a hobby.许多退休的人都以从事园艺为嗜好。
    2 gulf      n.海湾;深渊,鸿沟;分歧,隔阂 参考例句:
    The gulf between the two leaders cannot be bridged.两位领导人之间的鸿沟难以跨越。
    There is a gulf between the two cities.这两座城市间有个海湾。
    3 adversary      adj.敌手,对手 参考例句:
    He saw her as his main adversary within the netpany.他将她视为公司中主要的对手。
    They will do anything to undermine their adversary's reputation.他们会不择手段地去损害对手的名誉。
    4 previously      adv.以前,先前(地) 参考例句:
    The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
    Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
    5 evade      vt.逃避,回避;避开,躲避 参考例句:
    He tried to evade the embarrassing question.他企图回避这令人难堪的问题。
    You are in charge of the job.How could you evade the issue?你是负责人,你怎么能对这个问题不置可否?
    6 attained      (通常经过努力)实现( attain的过去式和过去分词 ); 达到; 获得; 达到(某年龄、水平、状况) 参考例句:
    She has attained the degree of Master of Arts. 她已获得文学硕士学位。
    Lu Hsun attained a high position in the republic of letters. 鲁迅在文坛上获得崇高的地位。
    7 acceleration      n.加速,加速度 参考例句:
    All spacemen must be able to bear acceleration.所有太空人都应能承受加速度。
    He has also called for an acceleration of political reforms.他同时呼吁加快政治改革的步伐。

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