：“Thousands of years ago, the great philosopher Mencius said：‘A trail through the mountains, if used, becomes a path in a short time, but, if unused, becomes blocked by grass in an equally short time.’” (山径之蹊间,介然用之而成路；为间不用,则茅塞之矣.今茅塞子之心矣 —《孟子•尽心下》).
奥巴马中国行时说了一句文言文,请求这句话的原话（英语）还有古文的意译