如何正确编写以下代码，从而抛出此错误(底部的RenderFlex溢出126像素)。

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Example'),
        ),
        body: SingleChildScrollView(
          child: Column(
            children: <Widget>[
              // 此处放置超出边界的部件
            ],
          ),
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Example'),
        ),
        body: Column(
          children: <Widget>[
            Expanded(
              child: Container(
                // 此处放置超出边界的部件
              ),
            ),
          ],
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Example'),
        ),
        body: ListView.builder(
          itemCount: /* 列表长度 */,
          itemBuilder: (BuildContext context, int index) {
            return /* 列表中的部件 */;
          },
        ),
      ),
    );
  }
}