错误 TS2339：“字符串”类型上不存在属性“标题”

Question

我现在能做什么请帮帮我....TIA **component.html`

  <mat-accordion multi="true" *ngIf="posts.length > 0">
      <mat-expansion-panel *ngFor="let post of posts">
          <mat-expansion-panel-header>
              {{ post.title }}
          </mat-expansion-panel-header>
          <p>{{ post.content }}</p>
      </mat-expansion-panel>
  </mat-accordion>
  <p class="text-info-mat-body-1" *ngIf="posts.length ==0">No post added yet!</p>`**

{{post.title}},{{post.content}}“错误 TS2339：类型 'string' 上不存在属性 'content'。” **component.ts`

  export class PostListComponent implements OnInit {

    constructor() { }

    ngOnInit(): void {
    }

    @Input() posts:string[]=[];

  }

`**