2 sentences for 当头 (dāng​tóu)

1. 无论做什么工作，都要安全当头。

   wú​lùn zuò shén​me gōng​zuò, dōu yào ān​quán dāng​tóu.

   No matter what the job is, safety must come first.

   Source: Dong Chinese Dictionary

2. 面对当头而来的挑战，我们必须保持冷静。

   miàn​duì dāng​tóu ér lái de tiǎo​zhàn, wǒ​men bì​xū bǎo​chí lěng​jìng.

   Facing the challenges ahead, we must remain calm.

   Source: Dong Chinese Dictionary