大难用英语怎么说？

大难

例句

• We were called to the hospital twice, but the old man seemed to have nine lives, and before long made a complete recovery. 我们两次被召往医院，但老父亲大难不死，不久就完全康复了。
• The extinct volcano’s eruption would mean a cataclysm for the city. 死火山又重新喷发,对这座城市来说意味着大难临头。
• a presentiment of disaster 大难临头的预感
• The Mersenne prime is an important research topic number theory. 梅森素数分布研究是数学中的一大难题.
• Perhaps this is all befalllen us on your account, like Jonah in the ship of Tarshish. 也许,我们这次大难临头,正是由于你上了我们的船的缘故, 就像约拿上了开往他施的船一样.
• They were comparing notes on each other's progress towards solving that most taxing of all puzzles: the riddle of the human genome. 他们就解决人类所面临的最大难题，即人类基因组之谜的进展情况交换了意见。
• In heap leaching and extraction process, the leaching rate and floccus bottlenecked production. 堆浸萃取工艺中, 困扰生产的两大难题是浸出速率及萃取中的絮状物.
• Durability of soft mouse surfaces are always a tough question. 耐用性一贯是布质橡胶鼠标垫的大难题.
• A sense of impending doom came upon all of us. 我们所有人都有一种大难临头的感觉。
• I owe it to you that I survived the catastrophe. 亏得你我才大难不死.