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2019-07-28 14:43 来源:原创 网络编辑:locoy 阅读 报错

  

  Donald Trump's new book, Crippled America: How to Make America Great Again, went on sale Tuesday. It reinforces his campaign message that he would make the country strong again. Trump said his rival Ben Carson does not have the energy it takes to be president.

  "We need somebody with tremendous energy to straighten out the military, to straighten out ISIS, to straighten out our horrible trade deals, to terminate Obamacare and come up with something far better for far less money. You need somebody with tremendous personal energy to run as president. We have a president now that doesn't have energy," said Trump.

  Republican candidates by and large criticize the Obama administration and pledge to dismantle some of his policies. On Monday, the president ridiculed Republicans who suggest that the United States was better off before he took over.

  "According to them, everything was really good in 2008 when we were going through the worst economic crisis in our lifetimes; unemployed and uninsured rates were up, and we were hopelessly addicted to foreign oil, and bin Laden was still on the loose. This apparently was the golden age that I messed up,” said Obama.

  Several Republican presidential candidates, including current frontrunner Ben Carson, have teamed up to demand changes in the televised debates that would include limiting provocative moderator questions.

  "We should have moderators who are interested in disseminating information about the candidates," said Carson.

  But the idea has been all but abandoned after it met with widespread criticism and was ridiculed by President Obama.

  "If you can't handle those guys (moderators), then I don't think that the Chinese and the Russians are going to be too worried about you," joked Obama.

  While the Republican camp still does not have a consistent frontrunner one full year before the election, Hillary Clinton has established a strong lead on the democratic side.

  

  The underwater robot called Trident grew out of a 1970s magazine article about a treasure hunt.

  “There was this story that there was a robbery and gold was thrown to the bottom of this underwater cave, and all these treasure hunters and scuba divers, no one was able to get to the bottom…

  So Erichad this big idea that he was going to build this underwater robot to go explore.”

  David Lang and Eric Stackpole took a smartphone, and made it waterproof.

  Thrusters propel Trident through the water.

  The little robot, tethered to a buoy, can dive to a depth of 100 meters.

  It sends a video signal-including temperature, depth and directional information-to an operator, who controls Trident remotely via an Internet connection, and sees what it sees through a virtual reality headset.

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