词族 · D-day
词形变化
英语词源
- D-day (n.)
- 1918, "date set for the beginning of a military operation," with D as an abbreviation of day; compare H-hour, also from the same military order of Sept. 7, 1918:
The First Army will attack at H-Hour on D-Day with the object of forcing the evacuation of the St. Mihiel salient. [Field Order No. 8, First Army, A.E.F.]
"They designate the day and hour of the operation when the day and hour have not yet been determined, or where secrecy is essential" [U.S. Army Center of Military History Web site]. Now almost exclusively of June 6, 1944.
权威例句
- 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+。