如何让矩形的副本留在屏幕上，并且在pygame中是不可渗透的

import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((800, 600))

rect_x = 100
rect_y = 100
rect_width = 50
rect_height = 50

rect = pygame.Rect(rect_x, rect_y, rect_width, rect_height)

rect_color = (255, 0, 0)  # 红色

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    screen.fill((0, 0, 0))  # 清空屏幕

    pygame.draw.rect(screen, rect_color, rect)  # 绘制矩形

    pygame.display.flip()  # 更新屏幕