2 sentences

1. 我感觉到后腰一阵剧痛。

   wǒ gǎn​jué dào hòu​yāo yī​zhèn jù​tòng.

   I felt a sharp pain in my lower back.

   Source: AI Challenger 2017

2. 我突然感到肩膀上一阵剧痛。

   wǒ tū​rán gǎn dào jiān​bǎng shang yī​zhèn jù​tòng.

   Suddenly I felt a sharp pain in my shoulder.

   Source: AI Challenger 2017