| 单词 | effective vaccine |
| 释义 | effective vaccine In the absence of an effective vaccine, mass access to treatment could be the switch that begins to turn off the epidemic once and for all. The Times Literary Supplement (2011) On top of that, an effective vaccine can be designed only once the precise pandemic strain is known. Times, Sunday Times (2006) An effective vaccine could take six months to produce. Times, Sunday Times (2008) |
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