3 sentences

1. 这支钢笔出水极畅，写起字来非常舒服。

   zhè zhī gāng​bǐ chū​shuǐ jí chàng, xiě qǐ zì lái fēi​cháng shū​fu.

   The ink flow of this pen is very smooth, making it very comfortable to write with.

   Source: Dong Chinese Dictionary

2. 由于血液循环不畅，他的手臂感到有些麻痹。

   yóu​yú xuè​yè xún​huán bù chàng, tā de shǒu​bì gǎn​dào yǒu​xiē má bì.

   Due to poor blood circulation, his arm feels a bit numb.

   Source: Dong Chinese Dictionary

3. 老友重逢，大家聊得十分投机，他感到心情甚畅。

   lǎo​yǒu chóng​féng, dà​jiā liáo de shí​fēn tóu​jī, tā gǎn​dào xīn​qíng shèn chàng.

   Reunited with old friends, everyone chatted very congenially, and he felt very happy and relaxed.

   Source: Dong Chinese Dictionary