A large number of iron-based superconductors have been discovered up to now, which have four typical categories: 1111-compounds, 122-compounds, 111-compounds, 11-compounds.
目前已发现的铁基超导体数量庞大种类繁多，较为典型的有四类：1111体系、122体系、111体系、11体系。
Teacher: Tom, can you tell me two animals which have four legs?
老师：汤姆，你能告诉我两个四条腿的动物吗？
Teacher: Tom, can you tell me two animals which have four legs?
老师：汤姆，你能告诉我两个四条腿的动物吗？
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