您的数据库类有两个较为方便的方法。
就使用方便这一范畴而言，在JDOM、dom4j和electric XML这三个主要竞争者中，dom 4 j与其它两个的区别在于它使用带有多个继承层的基于接口的方法。
Among the three leading contenders in the ease of use category, dom4j differs from the others in using an interface-based approach with multiple layers of inheritance.
为了更方便的比较其它方法，下面的图去掉了上一个图中数据检索最慢的两个方法。
The following version of the previous chart omits the two slowest data retrieval methods for ease of comparison between the other methods.
利用简单而方便的直接差分方法构造了两个新的人工边界条件。
Two new boundary conditions are presented directly by a difference approximation.
利用简单而方便的直接差分方法构造了两个新的人工边界条件。
Two new boundary conditions are presented directly by a difference approximation.
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