2 sentences for 戒严 (jiè​yán)

1. 政府在局势失控后宣布全城戒严。

   zhèng​fǔ zài jú​shì shī​kòng hòu xuān​bù quán chéng jiè​yán.

   The government declared martial law throughout the city after the situation got out of control.

   Source: Dong Chinese Dictionary

2. 由于外宾来访，广场周围实行了临时戒严。

   yóu​yú wài​bīn lái​fǎng, guǎng​chǎng zhōu​wéi shí​xíng le lín​shí jiè​yán.

   Due to the visit of foreign guests, temporary martial law was imposed around the square.

   Source: Dong Chinese Dictionary