Usage note
关键用于描述某件事情或某个因素在解决问题或达成目标时的重要性。
guān jiàn yòng yú miáo huì mǒu jiàn shì qing huò gè fēng yù zài jiě jie wèn tí huò chéng dāi mù biāo shí de zhòng yào xìnɡ.
关键 is used to describe the importance of something or a factor in solving problems or achieving goals.