有了PET扫描与MRI(核磁共振成像)，我们可以观察到大脑活动的波动，通过测量血液流动与营养物等级的变化。
With PET scans and functional MRI, we can observe fluctuations in brain activity by measuring changes in blood flow and levels of nutrients.
收集了国内外6个产地不同等级的香料烟样品，对其内在化学成分、必需营养元素和挥发性致香物质等进行了分析。
Different grades of Oriental tobacco samples from6producing areas at home and abroad were collected and analyzed for chemical components, necessary nutrition elements and volatile flavor sub-stance.
另一方面，乳过氧化物酶体系均可提高保鲜牛乳1～2个卫生等级，并且对其营养成分没有影响。
On the other hand, lactoperoxidase system could all improve the hygienic grade about 1 or 2 grade, and could not affect the nutrition composition of the preserved milk.
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