dé / zhī / tā / yù / dào / kùn / nan / hòu / péng / yǒu / men / fēn / fēn / xiě / xìn / miǎn / wèi / tā

得知他遇到困难后，朋友们纷纷写信勉慰他。

After learning that he was in difficulty, his friends wrote to comfort and encourage him.