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.
實(shí)用例句
1. Butter, margarine, and oily fish are all good sources of vitamin D.
黃油、人造黃油和多脂魚(yú)都含有豐富的維生素D。
來(lái)自柯林斯例句
2. In figure 24 "D" denotes quantity demanded and "S" denotes quantity supplied.
在圖24中，D代表需求量而S代表供應(yīng)量。
來(lái)自柯林斯例句
3. Milk, oily fish and egg all contain vitamin D.
牛奶、油性魚(yú)類和雞蛋都含有維生素D.
來(lái)自柯林斯例句
4. This special form of vitamin D is naturally present in breast milk.
