问使用迭代器对temp对象进行循环会产生不同的图形结果(Libgdx/Java)

EN

            for (int i = 0; i < particleList.size(); i++) {
            Iterator<Particle> it = particleList.iterator();
            while (it.hasNext()) {
                Particle p = it.next();
                if (p.isDead()){
                    it.remove();
                }

                p.render(batch, delta);
            }
        }

            Particle p;
        for (int i = 0; i < particleList.size(); i++) {
            p = particleList.get(i);
            p.render(batch, delta);

            if (p.isDead()) {
                particleList.remove(i);
                bulletPool.free(p);
            }

        }

    public void render(SpriteBatch batch, float delta) {
    sprite.setX(sprite.getX() + (dx * speed) * delta * Assets.FPS);
    sprite.setY(sprite.getY() + (dy * speed) * delta * Assets.FPS);
    ttl--;
    sprite.setScale(sprite.getScaleX() - 0.002f);

    if (ttl <= 0 || sprite.getScaleX() <= 0)
        isDead = true;

    sprite.draw(batch);
}