tā / men / suī / rán / cóng / wèi / jiàn / miàn / què / tōng / guò / shū / xìn / chéng / wéi / shén / jiāo / duō / nián / de / péng / you

他们虽然从未见面，却通过书信成为神交多年的朋友。

Although they had never met, they became longtime spiritual friends through letters.