Insert
 Usage
• Insert[list, elem, n] 在 list中的位置 n插入 elem 。如果n 是负的，位置从结尾计算。
• Insert[expr, elem,  i, j, ...  ] 在 expr中的位置  i, j, ...  插入 elem。
Notes
• list 可以有任何头，未必是List. • 参见 Mathematica 全书 : 节 1.8.6.
 Further Examples
This inserts d into the fourth position of this list.
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This inserts b in the first and second positions of this list.
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This function builds a random permutation of Range[n] by inserting one element at a time.
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This function "sows" copies of the specified object between each pair of entries of expr.
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This variant also places copies before the first and after the last elements.
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