They are limited to simple string values.

它们仅限于简单字符串值。

youdao

First, the example outputs a simple string.

首先，示例输出一个简单的string。

youdao

Consider the simple string class in Listing 1.

请考虑清单1中的简单字符串类。

youdao

And it boils down to modifying the format string with just a simple number.

它归结于是用一个简单的数字来,修改字符串的格式。

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