话不多说，上代码

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#include <iostream>
#include <thread>
#include <chrono>
#include <string>
using std::cout;
using std::cin;
using std::endl;
using std::flush;
using std::string;
using std::this_thread::sleep_for;
using std::chrono::seconds;
void think() {
    constexpr int kDotsCount = 3;
    constexpr auto kDotDelay = seconds(1);
    cout << "<think>";
    for (int i = 0; i < kDotsCount; ++i) {
        sleep_for(kDotDelay);
        cout << "." << flush;  // 合并输出和刷新操作
    }
    cout << endl;
}
int main() {
    cout << "请输入您的问题：";
    string question;
    getline(cin, question);
    think();
    cout << "服务器繁忙，请稍后再试。" << endl;
    return 0;
}

至于效果嘛，各位自行尝试