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。
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。
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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