2 sentences

1. 哨兵正挺立在岗上，警惕地注视着前方。

   shào​bīng zhèng tǐng​lì zài gǎng shàng, jǐng​tì de zhù​shì zhe qián​fāng.

   The sentry stood tall at his post, keeping a watchful eye on what lay ahead.

   Source: Dong Chinese Dictionary

2. 正当大家欢度春节的时候，他仍然坚守在岗位上。

   zhèng​dāng dà​jiā huān​dù Chūn​jié de shí​hou, tā réng​rán jiān​shǒu zài gǎng​wèi shàng.

   While everyone else was celebrating the Spring Festival, he remained at his post.

   Source: Dong Chinese Dictionary