如果发生此种疫情的时间和地点无法预测，我们何必不等待事情发生后再作出反应呢？因为我们所知道的甚少，这些问题反映的风险是难以评估的。

If the time and place of such episodes are unpredictable, should we not just wait and react after the fact? The risk reflected in these questions is difficult to evaluate because we know so little.

youdao

如果发生此种疫情的时间和地点无法预测，我们何必不等待事情发生后再作出反应呢？因为我们所知道的甚少，这些问题反映的风险是难以评估的。

If the time and place of such episodes are unpredictable, should we not just wait and react after the fact? The risk reflected in these questions is difficult to evaluate because we know so little.

youdao