当他完成马拉松时，他感到深深的满足。

He felt a deep sense of ___satisfaction when he completed the marathon.

对许多教师来说，主要的满足感来自于看到学生成功。

For many teachers, the main ___satisfaction comes from seeing their students succeed.

在掌握一项困难技能的过程中能获得巨大的满足感。

There's great ___satisfaction to be found in mastering a difficult skill.