Contrast is a basic method of language study.
比较是语言研究的一种基本方法。
The first method is average method, which decreases the contrast of images in some degree.
平均法在一定程度上降低了图像的对比度；
Objective: To discuss the new method in contrast echocardiography of right heart.
目的：探讨右心声学造影新方法。
Objective: To discuss the new method in contrast echocardiography of right heart.
目的：探讨右心声学造影新方法。
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