lǎo / shī / jiě / shì / shuō / rán / qǐng / shì / yí / gè / biǎo / shì / bù / jiǔ / yǐ / hòu / de / shí / jiān / cí老师解释说,“然顷”是一个表示不久以后的时间词。The teacher explained that 然顷 is a time expression meaning shortly afterward.