dú / dǒng / zhè / fēng / xìn / bù / néng / zhǐ / kàn / zì / miàn / hái / yào / lǐ / jiě / qí / zhōng / de / yán / wài / zhī / yì

读懂这封信，不能只看字面，还要理解其中的言外之意。

To understand this letter, you cannot just read the literal words; you must also grasp the unspoken meaning.