2 sentences

1. 啄木鸟正在使劲地啄树干。

   zhuó​mù​niǎo zhèng​zài shǐ jìn de zhuó shù​gàn.

   The woodpecker is pecking the tree trunk vigorously.

   Source: Tatoeba

2. 突然，一只松鼠跑上松树的树干。

   tū​rán, yī zhī sōng​shǔ pǎo shàng sōng​shù de shù​gàn.

   Suddenly a squirrel ran up the trunk of a pine tree.

   Source: CCMatrix