在我的程序中，為了模擬運(yùn)動(dòng)，添加了點(diǎn)的x位置，清除舊點(diǎn)，繪制新點(diǎn)。def drawing_zombies():  clear()  for zombie in zombies:    goto(zombie.x, zombie.y)    dot(20, 'red')  update()def movement():  for zombie in zombies:    zombie.x -= 0.5  drawing_zombies()我見過一個(gè)極其相似的程序運(yùn)行，它的點(diǎn)不閃，看起來是真的在動(dòng)。但是，當(dāng)我的程序運(yùn)行時(shí)，它會(huì)閃爍（消失和重新出現(xiàn)的速度非?？欤┢溆啻a在下面（除了一堆定義矢量類的東西，它與工作程序中的相同，所以它里面沒有任何問題）class vector(collections.abc.Sequence):    precision = 6    __slots__ = ('_x', '_y', '_hash')    def __init__(self, x, y):        self._hash = None        self._x = round(x, self.precision)        self._y = round(y, self.precision)    #The rest of the vector class would have been herezombies = []placement_options = [0, 1, 2, -1]def new_zombie():    placement_level = random.choice(placement_options)    z = vector(200, placement_level*100)    print(placement_level)    zombies.append(z)def drawing_zombies():  clear()  for zombie in zombies:    goto(zombie.x, zombie.y)    dot(20, 'red')  update()def movement():  for zombie in zombies:    zombie.x -= 0.5  drawing_zombies()  for z in zombies:    if z.x < -200:      done()  ontimer(movement(), 50)def gameplay():  setup(420, 420, 370, 0)  hideturtle()  up()  new_zombie()  movement()  done()gameplay()