fourth letter of the Roman alphabet, from Greek delta, from Phoenician and Hebrew daleth, pausal form of deleth "door," so called from its shape. The sign for "500" in Roman numerals. 3-D for "three-dimensional" is attested from 1952.
双语例句
1. Butter, margarine, and oily fish are all good sources of vitamin D.
黄油、人造黄油和多脂鱼都含有丰富的维生素D。
来自柯林斯例句
2. In figure 24 "D" denotes quantity demanded and "S" denotes quantity supplied.
在图24中，D代表需求量而S代表供应量。
来自柯林斯例句
3. Milk, oily fish and egg all contain vitamin D.
牛奶、油性鱼类和鸡蛋都含有维生素D.
来自柯林斯例句
4. This special form of vitamin D is naturally present in breast milk.
