suī / rán / wèn / tí / hěn / nán / dàn / tā / xīn / lǐ / yǒu / pǔ / yī / diǎn / yě / bù / huāng

虽然问题很难，但他心里有谱，一点也不慌。

Although the problem is difficult, he has a clear plan and is not flustered at all.