Compounds in black tea can attack the bacteria that form plaque and prevent the plaque from sticking to teeth, U. S. researchers found.
美国的研究人员发现，红茶中的多种化合物可以杀灭导致牙菌斑的细菌，也可以防止牙菌斑粘附在牙齿上。
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You may be able to get a green card as an immediate relative or as a family member in a preference category if your u. S. citizen relative files a Form I-130, Petition for Alien relative, for you.
The chemical structures that form the units of DNA and RNA and that encode genetic information i.e. the bases that make up the base-pairs are A, G, T, C and U (see DNA).