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the earth. out space. the ocean. Mars.
viewpoint dimension appearance attitude
“鹦鹉螺”号（Nautilus） “阿尔文”号（Alvin） “和平”I号（MirI） “蛟龙”号（Jiaolong）
has come up was coming up had come up would come up
A research institute. A transporting vehicle. A submersible. A scientist.
has come up was coming up had come up would come up
Offering better views. Speed. Size. Both A and Ｂ.
the earth out space the ocean Mars
A research institute. A transporting vehicle. A submersible. A scientist.
Size. Speed. Shape. Both Ａ and Ｃ.
It can carry explorers as deep as 6,500 meters. It has played a key role in various important undersea expeditions It was launched in the sixties of the twentieth century. It has been used for more than 40 years.
has come up was coming up had come up would come up
Size. Speed. Capacity. Shape.
It can carry explorers as deep as 6,500 meters. It has played a key role in various important undersea expeditions It was launched in the sixties of the twentieth century. It has been used for more than 40 years.
Offering better views. Speed. Size. Both Ａ and Ｂ.
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