加强对比度的最好方法之一，是通过创建元素之间的大小差异，使得有些东西显示得比其它的大。

One of best ways to enhance contrast is by creating size differences between elements, making some things appear larger than others.

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这是一个很简单的示例，但它显示了这两种方法之间基本原理上的差异。

This is a very simple example, but it serves to show the difference in philosophy between the two approaches.

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方法采用差异显示反转录- P CR (DDRT - PCR)方法，寻找骨组织内与健骨冲剂疗效相关的有差异表达的基因。

Methods differential display reverse transcription PCR (DDRT-PCR) was used to detect the differentially expressed genes in bone tissues associated with therapeutic effect of JGG.

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