如何在pygame中停止在Surface上渲染运动图像的每一帧？

import pygame
pygame.init()

window_width = 800
window_height = 600
window = pygame.display.set_mode((window_width, window_height))
surface = pygame.Surface((window_width, window_height))

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # 在Surface上绘制图像
    # ...

    # 将Surface对象绘制到窗口上
    window.blit(surface, (0, 0))
    pygame.display.flip()

clock = pygame.time.Clock()
fps = 60  # 每秒渲染的帧数
while running:
    clock.tick(fps)
    # ...

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                # 停止渲染图像的每一帧
                # ...