translation.en: We have seen human-to-human transmission in at least three clusters -- fortunately involving very intimate contact, still not putting the world at large at any kind of risk.
translation.zh: 大家已经知道人-人传染 至少要三种方式。 幸运的是，这都涉及到近距离的接触 这还没有把世界置于更大的危险之中。