mindmap root((练习)) 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.