2 sentences

1. 他说话时，脸上的肌肉微微牵动了一下。

   tā shuō​huà shí, liǎn shàng de jī​ròu wēi​wēi qiān​dòng le yī​xià.

   As he spoke, the muscles in his face twitched slightly.

   Source: Dong Chinese Dictionary

2. 国际油价的波动牵动着全球经济的神经。

   guó​jì yóu jià de bō​dòng qiān​dòng zhe quán​qiú jīng​jì de shén​jīng.

   Fluctuations in international oil prices affect the nerves of the global economy.

   Source: Dong Chinese Dictionary