错误:“列表”不是“std”的成员，错误:模板参数 2 无效

我正在尝试编译我的头文件，但我遇到了无法弄清楚的错误。

我想创建一个包含 3 个映射的结构：-从单个单词到计数的映射-从单词对映射到计数- 从单个单词映射到以下单词列表

我的头文件中的代码：

#include <cstdlib>
#include <iostream>
#include <cstring>
#include <string>
#include <cctype>
#include <vector>
#include <algorithm>
#include <map>
typedef struct {
    std::map<std::string, int> firstCounts;
    std::map<std::string, int> pairCounts;
    std::map<std::string, std::list<std::string>> follows; //You can use an iterator to retrieve the values stored in the list. 
} LanguageModel;

我得到的错误：

>   LangModel.h:24:23: error: ‘list’ is not a member of ‘std’
>      std::map<std::string, std::list<std::string>> follows; //You can use an iterator to retrieve the values stored in the list. 
>                            ^
>     LangModel.h:24:23: error: ‘list’ is not a member of ‘std’
>     LangModel.h:24:38: error: template argument 2 is invalid
>      std::map<std::string, std::list<std::string>> follows; //You can use an iterator to retrieve the values stored in the list. 
>                                           ^
>     LangModel.h:24:38: error: template argument 4 is invalid
>     LangModel.h:24:44: error: expected unqualified-id before ‘>’ token
>      std::map<std::string, std::list<std::string>> follows; //You can use an iterator to retrieve the values stored in the list.