1. Working-class families feel an even keener sense of disappointment. 工人阶级家庭的失望感更加强烈。
2. They don't realize that the competition is getting keener and the required standards of work get higher and that their children may not be prepared for the change. 他们没有意识到竞争越来越激烈，所要求的工作标准越来越高，而他们的孩子可能还没有准备好迎接变化。
3. Smell is keener in dogs than in humans. 狗的嗅觉比人的嗅觉灵敏。
4. The leaders of the Maine towns are keener. 缅因州的领导者更为热心。
5. Mr Obama plainly has a keener sense than Mr Bush did of American limits. 在对美国局限性的认识方面，奥巴马先生显然要比布什先生敏锐。
