1:原富平 2021-02-24 05:18:13

2010年，马丁飞行器公司推出的喷气背包号称"世界上第一个盗版喷气背包"。这个喷气背包甚至还被列入《时代周刊》"2010年度50强发明"之一，因为众所周知世界上第一个喷气背包是在1958年发明的，且自1981年来一直在发展。喷气背包由温德尔·穆尔设计，他是贝尔空间系统公司的研究员。温德尔设计的喷气背包的早期模型飞行高度可达5米（16英尺），飞行时间为3分钟。这一点引起了美国军队的注意，美国军队便为这一项目投资了15万美元。后来，还特地为美国军队做了些试飞飞行器，也为肯尼迪总统做了飞行器。之后，因为飞行时间和飞行距离有限，美国军队取消了对这个项目后续研究的投资。美国航天局也想用喷气背包为阿波罗11号任务做支援，以防登机舱出故障。但之后还是改变了想法，改用了月球车。贝尔经历了这个挫折后，停止了对飞行器的进一步研究。

2:哈曼 2021-02-14 05:18:13

Quite a few students were disillusioned by UK visa regulations. “A lot of people saw the programme as a gateway to employment in Europe,” says one. “If this was the objective, then a lot of them would have gone away unfulfilled.”

3:埃利奥特 2021-02-18 05:18:13

That was true, too, of “Mad Men” on AMC. which in its seventh season has all but exhausted its characters and its 1960s setting, but is still keeping viewers guessing about the end, which won’t air until next year. “The Sopranos” ended ambiguously. “Breaking Bad,” put an end to Walter White. Now, the next television mystery looming ahead centers on Don Draper’s last moments, dead or alive.

4:阿卡迪亚 2021-02-08 05:18:13

9.在培养皿中跳动的心脏

5:格·季诺维也夫 2021-02-09 05:18:13

In a bid to raise awareness of one of the world's most endangered species and the Chengdu Panda Base in China, the 108 performers were hard to miss as they entertained Londoners and children during school visits with conservationist and base ambassador Nigel Marven.

6:孙尧 2021-02-23 05:18:13

总之，勒布朗在过去的9年里能很好地强化他那野兽般的身躯，我们感到很欣慰。

7:武广高铁 2021-02-25 05:18:13

现年60岁的罗斯是位于波士顿的哈佛大学的教授，而89岁的沙普利是美国加州大学洛杉矶分校的教授。

8:邓小虹 2021-02-09 05:18:13

其关于朋友间爱情、事业、友谊的主题仍然与今天的年轻人息息相关。

9:刘杭谊 2021-02-16 05:18:13

The January-to-November period in the United States this year was the warmest first 11 months of any year on record for the contiguous states. And 2012 will likely surpass 1998 as the warmest year on record for the nation, according to the National Oceanic and Atmospheric Administration.

10:鲍勃 2021-02-19 05:18:13

今年，竞争最激烈的职位--中国民主同盟中央委员会接待处--有大约10000人参与竞争。