程式碼也不復雜，直接上好了

using UnityEngine;
using System.Collections;

public class GUIPrintMachine : MonoBehaviour
{
    /// <summary>
    /// 間隔時間
    /// </summary>
    private float letterPause = 0.2f;

    public AudioClip clip;

    private AudioSource source;
    /// <summary>
    /// 暫存中間值
    /// </summary>
    private string word;
    /// <summary>
    /// 要顯示的內容
    /// </summary>
    private string text = "I'm Eagle,賴張殷,22,1994,handsome,live in guuangzhou";

    void Start()
    {
        source = GetComponent<AudioSource>();
        word = text;
        text = "";
        StartCoroutine(TypeText());
    }

    void OnGUI()
    {
        GUI.Label(new Rect(100, 100, 200, 200), "text show");
        GUI.Label(new Rect(50, 50, 250, 250), text);
    }

    /// <summary>
    /// 打字機效果
    /// </summary>
    /// <returns></returns>
    private IEnumerator TypeText()
    {
        foreach (char letter in word.ToCharArray())
        {
            text += letter;
            if(clip )
            {
                source.PlayOneShot(clip);
            }
            yield return new WaitForSeconds(letterPause);
        }
    }
}