英语时差：“二次浸釉”-真的很糟吗？（上）

You’re at a party. You grab a big crunchy potato chip and dip it into a dish of creamy onion dip. But now you’re left with half of a chip with no dip on it. You look at the half eaten chip. You glance around the room to see if anyone is watching. Should You Dip It Again? Before you give in to the temptation to double dip that chip, consider the findings of a study done at Clemson University on the effect of pre biting a chip on bacterial transfer to the dip, a.k.a. “double dipping”. Eight volunteer “chip dippers” dipped chips and crackers into different dipping solutions three to six times. Half the dippers bit the chip once between dips, the others redipped unbitten chips or crackers. Dips included cups of sterile water as well as commercial dips of different consistencies and with different common ingredients, like nacho cheese, chocolate, and salsa.