问为什么我的程序中的第二个while循环在它之前有一个while循环时不能工作？

EN

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main(){
    string line, line1, line2;
    int count = 0;
    int track = 0;
    int stop;
    ifstream file ("ai.txt");
    while (getline(file, line2)){
        count++;
    }
    file.seekg (0L, ios :: beg);
    stop = count - 10;
    while (getline(file, line)){
        track++;
        if (track >= stop){
            for (int num = 1; num <=10; num++){
                getline(file,line1);
                cout << line1 << endl;   
            }
        }
    }

}