Haircuts need practice and practice makes perfect.

理发需要练习，熟能生巧。

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You need practice to improve your skills.

你需要实践来提高你的技巧。

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Kids need plenty of practice delaying gratification and deploying effective organizational skills, such as managing time and setting priorities.

孩子们需要大量的练习来延迟满足感和运用有效的组织技能，比如管理时间和设定优先级。

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"We recommended hemorrhage drills just like fire drills. For an event that doesn't happen very often, people need to practice.

VOA: standard.2010.06.23

So that way you can have an idea if, oh, I do really understand this but I'm a little bit slow, maybe I need to practice this one type of problem a little bit longer so I can get up to speed so I'm going to be able to get through all this in terms of the exam time.

这样你就可以知道，假设，噢，我真的懂这个，但是我的速度有点慢，或许我需要在练习这个类型的题目上,多花一点时间,这样我就可以提高自己的速度,可以全部做完,在考试规定的时间内。

麻省理工公开课 - 化学原理课程节选

You just need to pass their test, and then you can practice as an attorney.

你只要通过他们的测试，然后你就可以当律师了。

想成为律师的话 - SpeakingMax英语口语达人

Now, of course, then they need practice and the basic frameworks to grammar and what not.

FORBES: Tim Ferriss: What Cooking Can Teach You About Learning

Researchers at the Technical University of Darmstadt disagree and have developed algorithms proving that robot arms just need practice, practice, practice to learn complex activities.

ENGADGET: German robot arm learns ping-pong as it plays humans, might rival its masters

You'll need to practice good oral hygiene for life, however, so your gum problems don't return.

CNN: Gingivitis