2 sentences

1. 边境局势十分紧张，战争一触即发。

   biān​jìng jú​shì shí​fēn jǐn​zhāng, zhàn​zhēng yī​chù​jí​fā.

   The border situation is very tense, and war could break out at any moment.

   Source: Dong Chinese Dictionary

2. 两军在平原上对阵，战斗一触即发。

   liǎng jūn zài píng​yuán shàng duì​zhèn, zhàn​dòu yī​chù​jí​fā.

   The two armies faced off on the plain; battle was imminent.

   Source: Dong Chinese Dictionary