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import turtle import time pen=turtle.Pen() turtle.bgpic("ship.gif") turtle.tracer(0) pen.color("black")  pen.pensize(15)   while True:    pen.dot(240,"black")    pen.dot(200,"#FFFFFF")    for i in range(8):     pen.forward(140)     pen.backward(140)     pen.left(360/8)    pen.right(1)    turtle.update()    pen.clear()   time.sleep(0.2) turtle.done() # 船舵动画