Widget build(BuildContext context) {
    return ListView(
      padding:const EdgeInsets.all(10),
      children: [
        Container(
          margin:const EdgeInsets.only(bottom: 10),
          height: 200,
          child: Image.network(
            "https://www.flutterschool.cn/images/xhs/1.png",
            fit: BoxFit.cover,
          ),
        ),
        Row(
          children: [
            Expanded(
                flex: 2,
                child: SizedBox(
                  height: 210,
                  child: Image.network(
                    "https://www.flutterschool.cn/images/xhs/2.png",
                    fit: BoxFit.cover,
                  ),
                )),
            Expanded(
                flex: 1,
                child: SizedBox(
                    height: 210,
                    child: Column(
                      children: [
                        Container(
                          margin:const EdgeInsets.only(left: 10,bottom: 10),
                          height: 100,
                          child: Image.network(
                            "https://www.flutterschool.cn/images/xhs/3.png",
                            fit: BoxFit.cover,
                          ),
                        ),
                        Container(
                          margin:const EdgeInsets.only(left: 10),
                          height: 100,
                          child: Image.network(
                            "https://www.flutterschool.cn/images/xhs/4.png",
                            fit: BoxFit.cover,
                          ),
                        )
                      ],
                    ))),
          ],
        )
      ],
    );