困难 - 艰难的挑战

used to refer to something that is inexplicably difficult

非常具有挑战性和复杂性

problems that a person encounters in the early stages of a project or activity

某事早期阶段的问题

said of something that is very complex or difficult for one understands or work with

非常复杂

(of a task) to be very difficult or almost impossible to do or complete

几乎不可能做到的事情

a difficult fight or challenge that requires a lot of effort and determination

非常困难或具有挑战性的任务

a task or challenge that requires an immense amount of effort, strength, or endurance to accomplish

几乎不可能完成的任务

a difficult and challenging situation or task that requires significant effort to overcome or complete

困难或具有挑战性的任务

a situation that causes difficulties for one

非常具有挑战性的任务

to attempt to do something that is beyond one's capability

做超出自己能力范围的事情

turning really red in the face because of doing a lot of physical activities

像樱桃一样红

used to describe a job or task that is too difficult or challenging

the hardest or most boring part of a task or job

任务中最无聊的部分

a situation that is very difficult because one is not prepared to deal with it

非常大的挑战

to utilize one's final and decisive efforts, often in a critical moment

使出全力