西瓜单词

D是什么意思

D

英 [diː] 美 [di]

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.

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。

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。