弘扬中华文化·传承国学经典

D是什么意思

D

英 [diː] 美 [di]

n. 字母D

基本词汇

英文词源

D: 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。

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。

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.

4. This special form of vitamin D is naturally present in breast milk.: 这种特殊形态的维生素D天然存在于母乳中。

5. I got a D+.: 我得了个D+。