Positive and negative contrast media for enhanced MR imaging of the liver were studied.

本文复习了肝脏磁共振增强扫描中所应用的阳性及阴性造影剂。

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Conclusion: Barium Sulphate Suspension has good MRI negative contrast effect, the Suspension presented here is suitable for clinical application.

结论：硫酸钡混悬剂有良好的阴性MRI造影效果，本研究提出的硫酸钡混悬剂可望用于临床造影。

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Often children can’t be bothered to struggle with a reader because the reward in the end is not worth the effort—slow tedium, that’s what basal readers provide. What a negative contrast to television!

孩子们经常不愿费点劲读基准读物，原因是到最后付出了努力却得不到应有的奖赏——冗长乏味，这正是那些基准读物所能提供的，与电视形成鲜明的对照！

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Those companies suffering negative coverage, in contrast, had underperformed by 34.6%.

ECONOMIST: Buttonwood

In contrast, the negative results for Vioxx and Celebrex showed a doubling or tripling of risk--about the same increase in cardiovascular risk as with obesity or smoking.

FORBES: Fear Mongering At The FDA

In contrast to the typically negative portrayal of the narcissistic personality syndrome, our results suggest that narcissism may be a key ingredient in overcoming organizational inertia.

FORBES: New Study: Egomaniacs Make the Best Leaders