给定两个链表，分别代表两组非负数字。
You are given two linked lists representing two non-negative numbers.
给出一个非负数的代表数字的数组，给这个“数字”加一。
Given a non-negative number represented as an array of digits, plus one to the number.
在清单1中，有两个可能的用于特性的setter的实现，该特性只能接受非负数值。
In Listing 1, there are two possible implementations of a setter for a property that can only take on non-negative values.
和c一样，在Vimscript中，对于布尔值来说，只有数值0为假；任何非0数值—不管是正数还是负数—都为真。
In Vimscript, as in c, only the numeric value zero is false in a Boolean context; any non-zero numeric value-whether positive or negative-is considered true.
第一个基准条件用来处理非整数；第二个用来处理负整数。在小数或者负数做参数的时候，函数就会输出错误信息，返回空到调用出来表明出错了。
The first base case handles nonintegers; the second handles negative integers. In both cases, the program prints an error message and returns None to indicate that something went wrong.
非 负数据处理的一种多元统计分析方法。
Non-negative matrix factorization (NMF) has been proposed for multivariate data analysis, with non-negativity constraints.
非 负数据处理的一种多元统计分析方法。
Non-negative matrix factorization (NMF) has been proposed for multivariate data analysis, with non-negativity constraints.
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