In his first years of high school, Gabriel would look pityingly at the music students, struggling across the campus with their heavy instrument cases, turning up at school for practice hours before anyone else had to be there.

在高中的头几年，加布里埃尔会可怜地看着那些学音乐的学生，他们带着沉重的乐器箱在校园里艰难地穿行，比其他人都早几个小时来到学校练习。

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Of course, the method is limited by environmental factor and precision of instrument when used in practice.

当然，这一方法在实践中的运用还会受到环境因素、仪器精度等的限制。

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In our view, marketing engineering is an important instrument for bridging the gap between marketing theory and practice.

我们认为，市场营销工程是为弥合市场营销理论与实践的差距的重要手段。

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He says that even though he has another piano to play, he always sits down at his practice instrument.

NPR: Charlie Haden And Keith Jarrett Channel The Standards

Traditionally, a child learns to play music by being taught how an instrument works, and learning to play easy pieces that they practice over and over.

CNN: Music: It's in your head, changing your brain