维生素C促进食物中铁的吸收。Vitamin C increases the absorption of iron from food.这是铁的事实,无庸置辩.That is an ironclad fact that is beyond controversy.为马钉蹄铁的人叫做蹄铁匠.A man who shoes horses is called a farrier....
untapped reserves of oil未开采的石油储量We must make use of our untapped reservoirs of talent.我们必须利用我们尚未利用的人才.The region is thought to have some of the world's largest untapped oil reserves.该地区据信有世界上最大的未开发石油储藏....