词海拾贝

理解诱思

How much can farming really improve people’s health?In a market in southern Uganda two traders squat behind little piles of sweet potatoes and a sign that says “with extra vitamin① A”.A passing shopper complains about the price:10% more than ordinary sweet potatoes.Yes,say the traders,but they’re better,bred② with extra vitamin A.The bargaining goes back and forth,but the struggle to improve the crop has already been won.Since 2007,when an outfit began distributing the “biofortified”(生物合成) root crop in Uganda and Mozambique,50,000 farmers have started to plant it or crops like it.Vitamin A intake has increased and the produce commands higher prices.The shopper eventually buys some.