a. enjoying or showing or marked by joy or pleasure
s. well expressed and to the point
a. 快乐的, 幸福的, 愉快的, 恰当的
1. I feel happy when I see my friends.
当我看到我的朋友时，我感到快乐。
2. She is happy to help others.
她乐于帮助别人。
3. The children are happy playing in the park.
孩子们在公园里玩耍时很快乐。