n. a funeral lament sung with loud wailing
s. having a sharp cutting edge or point
a. 锋利的, 敏锐的, 强烈的, 敏捷的, 热心的, 渴望的
n. 挽歌, 痛哭
v. 唱挽歌, 痛哭
1. She has a keen interest in photography.
她对摄影有浓厚的兴趣。
2. He is a keen observer of human behavior.
他是一个敏锐的人类行为观察者。
3. The students were keen to learn new things.
学生们渴望学习新知识。