3．Unlike a single advertisement, an ad campaign is an organized programme of advertisements using various kinds of ads to reach a particular audience.

　　→An ad campaign is a programme of advertisements organzed by advertisers using various kinds of ads to reach a particular audience, which is unlike a single advertisement.

　　4．A commercial advertisement is one which someone has paid for to promote a product or service.

　　→To_promote a product or service, the producer has to pay_for a commercial advertisement.

　　5．PSAs are meant to teach us and help us lead better lives.

　　→PSAs are intended to improve our life qualities.

　　Ⅲ.完成译文

　　1．为了上大学，他决心努力学习英语。

　　In order to go to college, he made_up_his_mind to study English hard.

　　2．你得确切地知道你想让他们做什么，这很重要。

　　It's important to_know exactly what you are trying to get_them_to_do.

　　3．是你决定想让观众知道或想到什么的时候了。

　　It's time for_you_to_decide what you want the audience to know or think about.

　　4．周杰伦特别受年轻人欢迎。

　　Jay appeals_especially_to young people.

　　5．不知道他们对我的提议会有什么反应。

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