Biodiesel (fatty acid alkyl esters) is a cleaner burning diesel replacement fuel made from natural, renewable sources such as new and used vegetable oils and animal fats.

• 生物柴油（脂肪酸酯）源于天然的、可再生的资源（如新的或用过的植物油或动物油脂），是一种比柴油更加清洁的替代品。