输入字符中包含不是有符号数字的字符。

An input character was encountered that was not a signed digit.

youdao

基于符号数字负二进制表达，提出了任意字长操作数的并行两步加法与一步减法。

Based on sign digit negabinary representation, the two step addition and one step subtraction of arbitrary length operands can be performed.

youdao

将数字作为文本对待会产生错误结果，尤其是当这些值是有符号数字时，因此，列文本必须转换为数字类型。

Treating numerical values as text yields incorrect results, especially if those values are signed; therefore, the column text must be converted to a numerical type.

youdao

If you give a sign, on top of the number, that takes care of all ambiguity in one dimension.

如果你在数字前加一个符号,就把一维运动的所有的歧义解决了

耶鲁公开课 - 基础物理课程节选

Not by some very arcane numeric address inside my computer's memory, but by a symbol, by a name.

不是通过一些在我电脑内存中的神秘的数字地址,而是通过一个符号，一个名字。

哈佛公开课 - 计算机科学课程节选

H2 The label above this figure refers to H2.

这个数字上的符号是。

麻省理工公开课 - 固态化学导论课程节选