I was seven or eight years old and from that age on I really got keen at going to the sea and knowing about the ocean."

VOA: standard.2010.06.21

Thus isolated, thus removed, the vision acquired an especially keen charm that made me race with all speed toward my lone gratification.

如此形影相吊，如此销魂，这景色生出,一种勾人心魄的诱惑力，促使我全速跑向,我孤独的尤物。

耶鲁公开课 - 1945年后的美国小说课程节选

That's a keen observation.

很敏锐的观察力。

哈佛公开课 - 幸福课课程节选

They have nothing. They are just hoping for something,". Asked about the security situation in Port-au-Prince, U.S.General Ken Keen noted that gang activity and lawlessness existed in Haiti before the earthquake.

VOA: standard.2010.01.18

"We don't understand how come a mediator who was supposed to defend the cause of democracy will help us to embrace something we've been fighting for nine months, thinking that we were willing or keen to accept a token of gratitude from the general,".

VOA: standard.2009.03.12