public void UFOIsShot(UFOController UFOCtrl)
{
// 响应UFO被击中的事件
scorer.record(difficultyManager.getDifficulty());
actionManager.removeActionOf(UFOCtrl.getObj());
UFOfactory.recycle(UFOCtrl);
explosionFactory.explodeAt(UFOCtrl.getObj().transform.position);
}
