新款机型与之前的iPhone4在外形上非常相似，但配置了升级换代的摄像头，速度更快的处理器，以及为人瞩目的声控软件，这一软件可以使用户向手机发问。
The new model looks similar to the previous iPhone 4 but has an upgraded camera, faster processor and highly regarded voice-activated software, which allows users to ask questions.
介绍了SAE J 300内燃机油粘度分类的沿革，阐述了促进其升级换代的主要影响因素。
The evolution of viscosity classification of SAE J300 engine oil is explained, while main influence factors promoting the upgrading are discussed in this paper.
介绍了SAE J 300内燃机油粘度分类的沿革，阐述了促进其升级换代的主要影响因素。
The evolution of viscosity classification of SAE J300 engine oil is explained, while main influence factors promoting the upgrading are discussed in this paper.
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