Challenge, the feeling of accomplishment, and knowing that you have made a contribution.
挑战,成就感和知道自己做出了贡献。
I will be leaving the hospital in December.
我将在十二月份出院。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.