如果前方环岛您准备直行，进入环岛时您不必打转向灯，但驶离环岛时要提前打左转向灯，这样做正确吗？If you are planning to go straight at the roundabout, you do not need to use your turn signal when entering, but you should use your left turn signal before exiting the roundabout. Is this correct?