匹配任何单一字符（_）

mask any single character (_)

youdao

这里有一个小技巧：在内联中替换单一字符。

Here comes the tricky bit: replacing a single character inline.

youdao

这将XML文件作为单一字符串传递到下游步骤或进一步处理的阶段。

This passes the XML file as a single string to a downstream step or stage for further processing.

youdao

- We know from Wednesday if -- briefly -- that there's this thing called a "char" or "char," depending on how you want to pronounce it, which is just a single character but where there's also an int.

我们知道从周三起--简单说下-,我们有个叫做“char“或“char“,看你们怎么读它了，那代表一个单一的字符,但那里会有个整型数与之对应。

哈佛公开课 - 计算机科学课程节选