名詞 ad:

1. a public promotion of some product or service
   同義詞：advertisement, advertizement, advertising, advertizing, advert

副詞 ad:

1. in the Christian era; used before dates after the supposed year Christ was born
   同義詞：A.D., anno Domini

1. Problems were solved on an ad hoc basis.
   做了一些變通問題便解決了。
2. The actress often forgot her lines but was very good at ad libbing.
   那個女演員常忘臺詞，卻極擅長臨時拼湊。
3. I had forgotten to bring my notes and had to speak ad lib.
   我忘記帶講稿了，只好臨時講幾句。
4. I don't want to go on working here ad infinitum.
   我不愿意永遠在這里干下去。
5. Having been together for more than60 years, Eric and Betty were regarded as the Darby ad Joan of he village.
   埃里克和貝蒂生活在一起60多年了，他們被認為是村里一對幸福的老夫婦。
6. That's an interesting ad.
   那是有趣的廣告。
7. Fished all day without a bite; an ad that got a few bites but no final sales.
   一整天沒半條魚上鉤; 這則廣告吸引了一些人上鉤，但最后還是沒有賣出東西
8. I got four replies to my ad about the bicycle for sale.
   已經收到了四份對我出售自行車廣告的回信。

.ad
abbr.（略語）
Andorra [in Internet addresses]
Andorra[in Internet addresses]