ad
ad — 名詞
1. an informal short form for an advertisement in print, online, or on TV.
廣告
advertisement 的口語短稱
an informal short form for an advertisement in print, online, or on TV.
I saw an ad for guitar lessons on the station wall.
我在車站的牆上看到一則吉他課廣告。
ad for + product or service
On the bus, Esme laughed at a strange toothpaste ad.
在公車上，Esme 看著一則奇怪的牙膏廣告笑了。
The company placed a full-page ad in Saturday's newspaper.
那家公司在週六的報紙上刊登了一則全版廣告。
After dinner, Dad skipped the ad and changed the channel.
晚飯後，爸爸跳過那則廣告，轉了台。
- advertisement
the full and more neutral form
- commercial
usually means an advertisement on TV, radio, or online video
- promo
more informal and often used for short promotional material
文法句型
an ad for something
place/run an ad
see an ad on TV or online
用法筆記
Informal in everyday speech and headlines. In more careful writing, the full word 'advertisement' is often preferred, especially in formal contexts.
常見錯誤
2. the abbreviation AD, used for Alzheimer's disease, an illness that slowly harms
阿茲海默症
常縮寫成 AD 的疾病
the abbreviation AD, used for Alzheimer's disease, an illness that slowly harms memory and thinking.
At Dad's care meeting, the doctor said AD was causing his memory loss.
在爸爸的照護會議上，醫生說 AD 正在造成他的記憶喪失。
medical abbreviation in records
After her diagnosis, Mei read a booklet about AD at home.
確診後，Mei 在家讀了一本關於阿茲海默症的小冊子。
At the clinic, the doctor explained how AD affects memory.
在診所裡，醫生解釋了阿茲海默症如何影響記憶力。
Researchers hope new drugs will slow AD in older patients.
研究人員希望新藥能減緩高齡病患的阿茲海默症。
- Alzheimer's disease
the full name, used much more often in general speech
- dementia
a broader group of conditions; AD is one type of dementia
文法句型
AD affects memory
diagnose AD
patients with AD
用法筆記
Seen mainly in medical notes, research writing, and support materials. In ordinary conversation, people usually say the full name 'Alzheimer's disease' instead of the abbreviation.
常見錯誤
ad — 副詞
1. used before a year number to show that the year is counted after the birth of Je
西元
表示耶穌出生後的年份
used before a year number to show that the year is counted after the birth of Jesus Christ in the traditional Western calendar.
The old temple was first rebuilt in AD 612.
那座古廟最早在西元 612 年重建。
in AD + year
Historians date the letter to AD 79, before the eruption.
歷史學家把那封信定年為西元 79 年，也就是火山爆發前。
A stone cross from AD 950 stands outside the village church.
一座西元 950 年的石十字架立在村裡教堂外。
The textbook marks AD 476 as the end of the empire.
課本把西元 476 年標成那個帝國的終點。
- Anno Domini
the full Latin form
- CE
a modern neutral alternative, usually written after the year
- BC
used for years before the traditional birth date of Jesus Christ
文法句型
AD + year
in AD 430
from AD 950
用法筆記
Placed before the year number in traditional English dating. Many modern books instead use 'CE' after the year, especially in academic or interfaith writing.