translation.en: It's either the little voice at the back of your head, or it's that gut feeling you get when you've done the right thing, so when you've picked the paper bag or when you've bought a fuel-efficient car.
translation.zh: 它要么是你脑中那个影响你决定的声音 要么是当你做了正确的选择时 你的那种直觉。 比如，当你选择了纸袋 或者当你买了一辆节能车。