难关 is a common and versatile term used in both formal and informal contexts, though it always carries a sense of seriousness.
In Business: It's frequently used to describe financial crises, market entry barriers, major project deadlines, or technological bottlenecks. A CEO might say, “我们公司必须渡过这个难关” (Our company must get through this difficult period).
In Personal Life: It can refer to academic challenges (like the 高考 gāokǎo, college entrance exam), health crises, relationship problems, or financial struggles. A friend might encourage another by saying, “只要我们坚持,就一定能渡过难关” (As long as we persevere, we can definitely overcome this hardship).
In Media and National Discourse: Leaders and journalists often use 难关 to describe national challenges like economic downturns, natural disasters, or public health crises, framing them as collective trials for the nation to overcome together.