drill 侧重进行有系统的，严格和重复的练习。
exercise 主要指为强壮体魄而进行的锻炼，也可指进行练习以保持已经获得的技巧。
practice 指把所学的理论或知识用于实践以获得技艺与技巧。
training 普通用词，泛指为从事某种职业而进行的身体或智力方面的训练。
discipline 既可指训练又可指为达到某种熟练程度而进行的约束。
参考例句
1. Practice is the key to any skill . 实践是取得任何技能的要诀。
2. Do you ever practice conversations with friends? 你与朋友一块练习过会话吗？
3. I think our listeners better practice this one outside at first. 起初，我认为我们的听者们会更好的实践这个。
英英解释
n.
1. a customary way of operation or behavior
2. systematic training by multiple repetitions
3. translating an idea into action
4. the exercise of a profession
5. knowledge of how something is usually done v.
1. learn by repetition
2. avail oneself to
3. carry out or practice; as of jobs and professions
4. engage in a rehearsal (of)
