类可以由那些拥有部件的类组成，允许您按照层级结构将一个系统逐步分解成任意的层次。
Classes can be composed of classes which themselves have parts, allowing you to hierarchically decompose a system to any arbitrary level.
作为一般概念，模块化有助于将应用分解为不同的部件，各个部件可以单独测试(和开发)。
Modularity is useful as a general concept to break down an application into different parts, which can then be tested (and evolved) separately.
不久，分析家们为了确定这款手机的主要零部件供应商，纷纷对它进行分解。
Soon after, analysts scrambled to take the phone apart to pinpoint the major component suppliers for the device.
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