【英语时差8,16】五秒规则，真相还是神话？（上）

In 2007, microbiologists at Clemson University put the five second rule to the test.

They coated squares of tile¹, wood flooring and carpet with a solution of Salmonella bacteria, waited for it to dry, and then tested how many bacteria transferred from the surfaces to food dropped on them.

After only five seconds on the smooth tile floor, nearly 99% of the bacteria cells had transferred to a slice of bologna. Transfer of bacteria from wood floor and carpeting was lower; after five seconds five to seventy percent of the bacteria had transferred to the bologna.

Although a slice of bread picked up fewer bacteria than the bologna did, it still was contaminated² with loads of bacteria after five seconds on the floor.

1 tile   

n.砖瓦；vt.铺以瓦，铺以瓷砖

参考例句：

• The bathroom is faced with tile.浴室铺着瓷砖。
• I pointed to a number of scratches in the tile floor.我指向地板砖上的一道道划痕。

2 contaminated   

把…弄脏，污染( contaminate的过去式 )； 玷污，毒害，腐蚀（人的思想或品德）

参考例句：

• The drinking water has become contaminated with lead. 饮用水被铅污染了。
• The site was found to be contaminated by radioactivity. 发现此地受放射线污染。