【英语时差8,16】从指间到手的细菌（上）

（单词翻译）

 Back in the late 1800s, detectives first started using fingerprints¹ to identify criminals. More recently, during the past few decades, DNA² has become an important tool for crime scene investigators³. Now, bacteria may have their day. Hand bacteria, that is–as in the unique mix of bacteria that live on a person’s hands. The human body is teeming⁴ with bacteria. In fact, there are more bacterial⁵ cells in our bodies than human cells. Researchers have found that our hands harbor around 150 bacterial species. But the specific variety of bacteria is largely unique to each hand. Only about 13 percent of bacteria found on a given hand is shared with any other hand.