圆不会移动JavaFX中的位置

import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        Pane root = new Pane();
        Scene scene = new Scene(root, 400, 400);

        Circle circle = new Circle(50);
        circle.setTranslateX(100);
        circle.setTranslateY(100);

        TranslateTransition transition = new TranslateTransition(Duration.seconds(2), circle);
        transition.setToX(200);
        transition.setToY(200);
        transition.setAutoReverse(true);
        transition.setCycleCount(TranslateTransition.INDEFINITE);
        transition.play();

        root.getChildren().add(circle);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}