可以通过对请求体进行复制，并在新的对象中加入需要更改的值来解决这个问题。示例代码如下：

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class ApiService {
  private baseUrl = 'http://example.com/api';

  constructor(private http: HttpClient) { }

  postRequests(reqBodies: Array