使用alignment: WrapAlignment.spaceBetween

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Wrap(
          alignment: WrapAlignment.spaceBetween,
          children: [
            Text('very long text'),
            Text("another text"),
          ],
        ),
        SizedBox(height: 16),
        Wrap(
          alignment: WrapAlignment.spaceBetween,
          children: [
            Text('verylongtext' * 3),
            Text("another text"),
          ],
        ),
      ],
    );
  }
}