关于在不同位置的初始化

public partial class Form1 : Form
    {
        Student student;
        Teacher teacher;
        public Form1()
        {
            InitializeComponent();
             teacher = new Teacher("");
             student = new Student("蜗");
         
           
        }

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private void button1_Click(object sender, EventArgs e)
        {
            Teacher teacher = new Teacher("");
            Student student = new Student("");
        }



这两种初始化有什么区别吗？