1. We happiness of smiled, and carefree played, now and painful of recollection. 我们快乐的笑过，无忧无虑的玩过，现在又痛苦的回忆。
2. The mind states are five, and are subject to pleasure or pain; they are painful or not painful. 精神状态从属于五种形式，快乐或是痛苦的（临界于痛苦与不痛苦的边缘）。
3. There is certainly much work which is exceedingly irksome, and an excess of work is always very painful. 毫无疑问有许多工作是令人非常厌烦的，而且，工作过多总是十分痛苦的事。
英英解释
adj.
1. causing physical or psychological pain
2. causing misery or pain or distress
3. exceptionally bad or displeasing
4. causing physical discomfort
