practice: may imply a doing habitually or regularly: ~ one's profession; or a doing over and over for the sake of acquiring proficiency and skill: ~ on the piano each day. (proficiency精通，指全面的能力thorough ability)(skill技术: 专业知识+精通 technocal knowledge and proficiency)
exercise: implies a keeping at work and often suggests resulting strengthening and development: ~ muscles by active play.
drill: connotes an intent to fix as a habit, and stresses repetition as a means of training and disciplining : ~ school children in pronunciation.
practice: 两个意思 1) 从事: 有规律的做某事, 如practice medicine从医； 2) 练习: 一遍遍做，为了精通熟练， exercise操练：持续锻炼(work这里表示使用力量)，为了强化发展， drill训练: 重复的培训训练(train,drill)，为了形成习惯(habit习惯: 不经意的做某事)。
记忆方法：1) PED: 词根表示脚，想象成脚部练习。(biped：二足动物，impede: 阻碍)
2）三种练习的目的不同: 精通熟练，发展强化，培养习惯，同义词也需要这三种练习。
3）练习的意思是反复实践mean to perform or make perform repeatedly.
How do you get to Carnegie Hall?
Practice!
请问卡耐基大厅怎么走？
练习!
今天是元旦，祝大家新年愉快，学习进步!
Jason, 2018.1.1
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