a metal cleat on the bottom front of a horseshoe to prevent slipping 同义词：calk,
例句与用法
1.
Calkin ' s handicap system 卡尔金式差点比赛制
2.
Calkins publishes a paper in the psychological review extending ebbinghaus ' memory research 在《心理学评论》发表论文扩展艾宾浩斯的记忆研究。
3.
" we try to push adult stuff down on younger and younger kids , and what ' s the point " asked lucy calkins , founding director of the reading and writing project at columbia university ' s teachers college 哥大教师学院读写计画创办负责人露西卡尔金斯问道：我们想把成年人的读物硬生生塞给年龄层越来越低的孩子，为什麽？
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