Also, they contain no elements except the new service method, again because the methods will be merged into existing classes.
而且，除非是新的服务方法，否则它们不包含元素，还有就是因为这些方法将被合并入现有类。
But maps lack some of the features expected of structured data: they have no real "type" (without added metadata) and, unlike classes, they can't be extended with new behavior.
但是映射缺乏一些结构化数据的预期功能：它们没有真实的“类型”(在不添加元数据的情况下)，不像类那样，它们不能通过新的行为扩展。
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。
While a major effort is under way to develop new classes of antimalarials, no replacement products are on the immediate horizon.
虽然正在加大努力研制新型抗疟药物，但没有近期可见的替代制品。
And - certainly among the upper classes - they wanted new and different plants that no-one else had.
而且- - -当然，在上流社会——他们想要的是那些别人并不曾拥有的奇花异草。
Such studies will also, no doubt, give rise to an industry testing new classes of "probiotics" that can be added to food in order to ameliorate its obesity-inducing effects.
这样的研究无疑将促使相关产业开发和测试新的可以添加到食物中的益生菌以改善食物的肥胖副效应。
The first method that I mentioned is fairly applicable. It is simply an addition of new classes and provides no serious problem for coding, graphics or testers.
前述第一种方法非常易行，仅仅增加新的职业，并不会带来很多写代码、美工和测试的麻烦。
As only-children, they had no baby brothers or sisters to take care of, so every day for them is new. Like many other couples, the Kaufmans took pregnancy and childbirth classes together.
作为独生子女，没有照顾过小宝宝，所以每天对他们都很新鲜，和其它许多夫妇一样，考夫曼两口一起去上妊娠及分娩课。
There is no let-up in the growth of the number of patents issued each year, but the introduction of fundamentally new classes of technology seems rarer now than it was in the past.
每年发布的专利数量的增长并没有减少，但是根本地全新的技术的介绍看起来比过去更加少了。
A new report from the Center for Evaluation and Education Policy at Indiana University says eighteen states have full-time virtual schools. There are no buildings. All classes are online.
印第安纳大学评估和教育政策中心一份新的报告称，18个州拥有全日制虚拟学校，没有校舍，所有的课程都是在网络上学习。
A new report from the Center for Evaluation and Education Policy at Indiana University says eighteen states have full-time virtual schools. There are no buildings. All classes are online.
印第安纳大学评估和教育政策中心一份新的报告称，18个州拥有全日制虚拟学校，没有建筑，所有的课程都是在网络上学习。
A new report from the Center for Evaluation and Education Policy at Indiana University says eighteen states have full-time virtual schools. There are no buildings. All classes are online.
印第安纳大学评估和教育政策中心一份新的报告称，18个州拥有全日制虚拟学校，没有建筑，所有的课程都是在网络上学习。
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