Cons (which stands for construct) takes two arguments, the node data and the list that the bottom half of the pair will point to.

cons(代表construct)获得两个参数，即节点数据以及pair的下半部分将要指向的列表。

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NASA's NEEMO 12 mission will send a pair of astronauts, two doctors and two robotic surgeons to the bottom of the Atlantic Ocean for tests inside the Aquarius undersea laboratory.

NASA的极端环境实验会将一组由宇航员、工程师和科学家的队伍送至大西洋海地的宝瓶座海底实验室。

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