Even if your fingertips are not soiled by blood, dirt, or Cheeto dust, they will still leave behind chemical imprints on things you touch because the sebaceous glands under our skin secrete a cocktail of sweat, oils, and amino acids.

即使你的指尖没有被血液、污垢或奇多粉弄脏，它们仍然会在你接触的东西上留下化学印记，因为我们皮肤下的皮脂腺会分泌汗液、油脂和氨基酸的混合物。