整数
an integer
(cosmetics) nail polish
(entertainment) appearance fee; performance fee (money paid in order to secure the appearance of a person)
fold one's arms
In this problem, to understand the concepts of odd and even, you need to present a proof about the properties of integers.
在本题中,为了理解奇数与偶数的概念,需要给出关于整数性质的证明。
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