单词	tread upon
释义	tread upon v. 践踏
随便看	learning and adaptive system learning and maturation learning and memory Learning and Skills Council learning a person learning-apprentice strategy learning areas learning assessment learning assistance learning attitude learning automata learning automation learning automaton learning belief learning block learning by advice-taking learning by analogy learning by appointment system learning by being told learning by chance learning by contract system learning by deduction learning by discovery learning by doing learning-by-doing 卵与石斗卵石不敌卵覆鸟飞卶卷卷1 卷2 卷3 卷4 卷土重来福笑イ福耳福良すずめ福良スズメ福良雀福茶福袋福豆福運福音