以下为句子列表：
英文: The digital root of a positive integer is found by summing the digits of the integer.
中文: 正整数的数根可以用此整数各位数数字的和来求.
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英文: The input begins with a single positive integer on a line by itself indicating the number of the cases following, each of them as described below.
中文: 输入以一个正整数开始，它占一行，本身代表的是下面这种情形的数目，每一个都按下面的要求描述。
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英文: In 989,Bank,Laine and Langley raised and proved a perturbation result for second order differential equations with entire coefficients only of positive integer order.
中文: 989年,Bank,Laine和Langley提出并证明了一个二阶微分方程的扰动结果,但方程系数仅限于正整数级的整函数.
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