2 sentences

1. 在紧要关头，他保持了冷静。

   zài jǐn​yào guān​tóu, tā bǎo​chí le lěng​jìng.

   He stayed calm at the critical moment.

   Source: Dong Chinese Dictionary

2. 找到解决这个问题的锁钥是当前最紧要的事。

   zhǎo​dào jiě​jué zhè gè wèn​tí de suǒ yuè shì dāng​qián zuì jǐn​yào de shì.

   Finding the key to solving this problem is the most urgent matter at present.

   Source: Dong Chinese Dictionary