我们必须克服这个难关。
wǒmen bìxū kèfú zhègè nánguān 。
We must overcome this difficulty.
他在工作中遇到了很多难关。
tāzài gōngzuò zhōng yùdào le hěnduō nánguān 。
He encountered many crises in his work.
面对难关,我们要保持冷静。
miànduì nánguān , wǒmen yào bǎochí lěngjìng 。
In the face of difficulties, we must remain calm.