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群体免疫
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群体免疫
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群体免疫
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herd immunity
群体免疫
根据某种传染病流行区域与人群发病等流行病学特点,在人群中进行大规模的疫苗或菌苗接种以预防和控制其传播流行的措施。又称社区免疫。
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marine geodesy information processing system
marine geo-engineering
marine geographical information service system
marine geographic information data model
marine geographic information system
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Marine Geography of China
marine geological disasters
marine geological drilling
marine geological samples analysis
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marine geology and geophysics observation apparatus
Marine Geology & Quaternary Geology
marine geomagnetic map
marine geophysical map series
marine geophysical survey
marine geophysics
marine geopolitics
marine gravimeter
marine gravimetric survey instrument
marine gravimetry
marine gravimetry corrections
marine gravity field
marine gravity gradiometer
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