a difficult task; nesting places on the cliffs are difficult of access; difficult times; a difficult child; found himself in a difficult situation; why is it so hard for you to keep a secret?

• 困难的任务；筑在悬崖上的巢很难接近；艰难的时期；难相处的小孩；发现她自己处在困难的境遇之中；为什么对你来说保守秘密是如此的艰难?