An 18-yek--old boy from New Jersey,Justin Beckerman,has built his own submarine (潜水艇) !

He calls it The Nautilus.

   Justin spent six months and about $ 2,000 building the submarine from the parts he found in stores or online.

    "I spent about one or two weeks designing it," Justin said in an interview. " I spent about two more weeks looking for all the parts."

    The submarine uses ballast tanks (压载舱) to stay underwater. A ballast tank is part of a submarine that holds water. It lets in water to help the submarine go down and lets water out to help the submarine go up.

    Justin also had to work out how to start the submarine. "The submarine has four battery systems (系统) 一three nain systems and one emergency (紧急情况) system,he said. The submarine's batteries allow it to move underwater for about two hours.

    Testing a machine underwater can be dangerous,so Justin's parents keep a close watch on him every time he goes down.

   He has also made an emergency plan to keep him safe if something goes wrong. He uses a PA system to communicate when he is underwater. 

    Justin has been building things since he was young" Justin starts with a dream,and he keeps it until Jie works out how to realize it," said Justin's dad. Justin has built other smaller submarines,but not all have been successful. One of them failed because its materials were not strong enough. But Justin kept trying,and finally built the working submarine he has now.

  What advice does Justin have for students?"Keep thinking,creating and dreaming."

71. What's the name of Justin's submarine?

Its name is.

72. How long did Justin work on his submarine?

He worked on it.

73. How many battery systems does the submarine have?

It has battery systems.

74. What does Justin do to keep him safe?

He makes an emergency plan,andwhen he is underwater.

75. What can we learn from Justin?

We can learn that we should.

 0  102594  102602  102608  102612  102618  102620  102624  102630  102632  102638  102644  102648  102650  102654  102660  102662  102668  102672  102674  102678  102680  102684  102686  102688  102689  102690  102692  102693  102694  102696  102698  102702  102704  102708  102710  102714  102720  102722  102728  102732  102734  102738  102744  102750  102752  102758  102762  102764  102770  102774  102780  102788  159627 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网