第二个重要的阶段，以itunes和iPod为特征，即苹果公司创建一项专门的服务，通过这种服务，苹果公司的iPod玩家可以购买个性化的歌曲，而这种歌曲的格式是专门为他们设计的，也就是只能用于iPod。
The second big phase was characterized by iTunes and the iPod, as Apple created a service focused on buying individual songs in a proprietary format designed for Apple's iPod players.
针对模块化设计的产品配置阶段，提出了基于模块族特征参数模型的模块配置集生成流程。
For the phase of product configuration in modular design, a process of product module configuration set is put forward based on the feature parameter model of module family.
方法取11~36周人胎肺组织常规石蜡包埋切片，HE染色观察胚肺各个发育阶段的成熟度，免疫组化检测SP-D时相性表达特征。
Methods Human fetal lung tissues from 11- to 36-week-old fetuses were assayed for lung maturity with HE staining and SP-D expression by means of immunohistochemistry.
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