Conventional abstraction mechanisms of general purpose programming languages such as methods and classes, are no longer sufficient for creating new abstraction layers.
通用语言中的传统的抽象机制，如方法和类，已不足以满足建立新的抽象层次的需要。
How to manage users: Logging in and out and attack methods on all layers?
如何管理用户：登陆，注销以及对所有层面的攻击方法。
The dispersion, double electrical layers theory, drying methods, surface modification and characterization methods in preparing process of nanometer particles were introduced in this article.
介绍了纳米粒子制备过程中的分散、表面双电层理论、干燥方法、表面修饰与表征方法。
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