Return values: If the function succeeds, the return value is nonzero; otherwise, it is zero (False).
返回值：如果函数成功，返回值是非零；否则，它是零(假)。
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.
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。
A string whose length is greater than zero is always evaluated as True when resolved to a Boolean function, even if its value is the string 'false'.
长度大于0的字符串在解析为Boolean函数时，总是被判断为True，即使它的值是字符串'false '时亦是如此。
If the result of the evaluated code is zero (that is, false), the corresponding element is removed from the list.
如果已计算的代码的结果为0(即false)，那么将从列表删除对应的元素。
In a binary system, each bit of information is either on or off, one or zero, true or false.
在二进位系统中，信息的每一位不是开就是关，不是一就是零，小是真就是假。
The result [of this conversion] is false if the argument is the empty String (its length is zero);
如果参数为空字符串的转换]结果[是假的（其长度为零）；
No one had positive pelvic lymph node and negative SLN, The predictive rate was 100% and the false -negative rate was zero.
未发现SLN无转移而盆腔其余淋巴结存在转移者，SLN对盆腔淋巴转移的预测准确性为100%，假阴性率为0。
In this way the warning rate of the system for the dangerous roadblock has reached 100% and the false warning rate is zero.
使系统对规定危险路障的报警率达到100%，且虚警率为零。
In this way the warning rate of the system for the dangerous roadblock has reached 100% and the false warning rate is zero.
使系统对规定危险路障的报警率达到100%，且虚警率为零。
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