通过树立在户外人形广告牌，我们告诉拥有血肉之躯的人们，除非你跟不会受到新型冠状病毒感染的人形广告牌一样，是金属制成的。否则，尽量留在家里才是你不易受新型冠状病毒感染最安全的选择。 Comparing the uninfected billboard (which are not be infected by coronavirus) with vulnerable human (who are easily infected by coronavirus), to let people know that they should stay home for their safety and social distance, because they are made from flesh and bone with feelings, not metal.