@AusThinkingGirl @taipan168 @covidtweets I'm not answering because I already told you that these sorts of polices are always a matter of tradeoffs, cost vs benefit.
Vaccines didn't take 5 years, that's the reality.
@AusThinkingGirl @taipan168 @covidtweets 我没有回答，因为我已经告诉过你，这些政策总是一个权衡、成本与收益的问题。
疫苗不需要5年，这就是现实。