但是，伊佛霉素的给予量可能需要远超过一年一次，他说——可能甚至要按月使用——因为该药对蚊子的效应持续时间不会很长。
But ivermectin would have to be given much more often than once a year, he says-perhaps even monthly-because the drug's effect on mosquito populations won't last long.
通过具体的计算发现，由撞击带来的直接效应是有限的，在短时间内会迅速衰减，但由此引发的二次效应却是十分显著的。
Based on the calculation of our model, we find that the direct effects of the impact are limited and will attenuate in a short time.
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