?詞典釋義：

d day [ d di ]

(n.) D日，即決戰日，指行動的開始日期。

用法：

d day通常用作名詞，表示行動的開始日期。也可以作為形容詞，表示某件重要的或決定性的時刻。

例句：

1. The invasion of Normandy was known as the d day of World War II.

諾曼底登陸被稱為二戰的D日。

2. The company's IPO was their d day, marking a new chapter in their business.

公司的首次公開募股是他們的D日，標志著他們業務上一個新篇章。

3. We have been preparing for this d day for months, and now it's finally here.

我們已經準備了數月之久，現在終于迎來了這個D日。

4. On d day, the troops were ready to launch their attack on enemy territory.

在D日當天，已經準備好向敵方發起進攻。

5. The team's championship game was their d day, and they were determined to win.

球隊的冠賽就是他們的D日，他們下定決心要贏得勝利。

同義詞及用法：

1. Day of reckoning：指最終評判或審判某人或某件事情的時刻。

例句：The election results will be our day of reckoning.

2. Turning point：指某件事情發生重大變化的時刻。

例句：The signing of the peace treaty was a turning point in the war.

3. Deadline：指某項任務或工作必須完成的最后期限。

例句：The deadline for the project is next Friday.

4. Milestone：指某件事情的重要里程碑。

例句：Graduating from college was a milestone in her life.

5. Climax：指某件事情達到高潮或頂點的時刻。

例句：The climax of the movie had everyone on the edge of their seats.

以上便是d day的詞典釋義及相關用法、例句和同義詞。希望本文能為各位讀者提供一些幫助，讓大家更好地理解和運用這個詞匯。此文由筆名為“小杰”的作者撰寫，愿與各位共同探討學習。