形容词
中文翻译：Unknown
同义词：
['seven-valent', 'seven-valent']
例句：
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1.The vaccine is heptavalent and can protect against several strains of the virus.
这种疫苗是七价的，可以预防多种病毒株。
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2. The new drug has a heptavalent formulation that is more effective than its predecessor.
这种新药有七价配方，比它的前身更有效。
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3. The research team found that the heptavalent vaccine was more effective in preventing COVID-19 than the standard vaccine.
研究小组发现，七价疫苗在预防COVID-19方面比标准疫苗更有效。