Fortunately for us, this is OK because variable expansion only happens when user_compile is executed.

对我们来说幸运的是，这没有问题，因为变量扩展只在执行user_compile时才发生。

youdao

You will notice that on a US keyboard, shift-4 is "$", which is the bash variable expansion character.

注意到了吗：在美国键盘上，shift-4是 "$"，它是bash变量扩展字符。

youdao

If a variable contains whitespace, the double quotation marks keep the variable expansion intact as a single argument.

如果一个变量包含空格，双引号会按原样把变量展开为一个参数。

youdao

We can use another form of variable expansion to select a specific substring, based on a specific character offset and length. Try typing in the following lines under bash.

可以根据特定字符偏移和长度，使用另一种形式的变量扩展，来选择特定子字符串。

youdao

We can use another form of variable expansion to select a specific substring, based on a specific character offset and length. Try typing in the following lines under bash.

可以根据特定字符偏移和长度，使用另一种形式的变量扩展，来选择特定子字符串。

youdao