But , he says nations have to balance the production of biofuel from food crops with biofuels from nonfood resources. 但是他说国家必须保持由食品作物生产的生物燃料和非食物资源之间的平衡。
As a possible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists. 然而,作为一种可能养殖的补充性食物资源,浮游生物正引起了海洋科学家们相当大的兴趣。