zhè xiē / tǔ fāng zi / suī rán / méi yǒu / kē xué / yī jù / dàn / zài / mín jiān / liú chuán / hěn / guǎng

这些土方子虽然没有科学依据，但在民间流传很广。

Although these folk remedies lack scientific basis, they are widely spread among the people.