1 sentence

1. 他为了那篇论文，洋洋洒洒地写了上万字。

   tā wèi​le nà piān lùn​wén, yáng​yáng​sǎ​sǎ de xiě le shàng​wàn zì.

   He wrote tens of thousands of words voluminously for that thesis.

   Source: Dong Chinese Dictionary