translation.en: But actually in scientific community there is great debate about what percentage of flu transmission between people is from sneezing and coughing and what percentage is on your hands.
translation.zh: 但是实际上，科学界有个大讨论， 是关于流感人际传播有多大比例 是通过打喷嚏和咳嗽， 多大比例是通过手的接触。