2 sentences

1. 听到命令后，那个人立即止步。

   tīng​dào mìng​lìng hòu, nà gè rén lì​jí zhǐ​bù.

   Upon hearing the command, the person stopped immediately.

   Source: Dong Chinese Dictionary

2. 前方是实验重地，非工作人员请在此止步。

   qián​fāng shì shí​yàn zhòng​dì, fēi gōng​zuò rén​yuán qǐng zài cǐ zhǐ​bù.

   The area ahead is a restricted laboratory zone; unauthorized personnel please stop here.

   Source: Dong Chinese Dictionary