中文:此曲只应天上有,人间,哪得几回闻。
英文:
(1) This song should only be available in heaven. It has not been heard but only a few times in this world.
"It has not been heard but only a few times in this world." 是比较文雅的说法。
(2) This song should only be able to be heard in heaven. It is rarely heard in this world.