第一句：Radio is fairly inexpensive with mass audience.
广播广告面向大众，而且费用不算高。
A: Direct mail is less expensive than TV or newspaper.
直接邮寄广告花费比电视及报纸少。
B: Yes, but it requires higher advance costs.
是的，但其预支费用较高。
A: But its audience are eaily selected, and demographics of percentage of serious recipients can be predicted in advance.
但是其目标对象较易选择，可以事先预测受众所占的比例。
第二句：only audio. The brevity doesn't allow for educating viewers about complex products. The audience will be less attentive.
但是广播广告只是一种对听觉的刺激。其简洁明了的要求难以制作复杂产品的广告。听众在收听时不会全神贯注。
A: Its audiences are largely segmented and easily targeted.
听众较分散，并且容易被锁定。
B: only audio. The brevity doesn't allow for educating viewers about complex products. The audience will be less attentive.
但是广播广告只是一种对听觉的刺激。其简洁明了的要求难以制作复杂产品的广告。听众在收听时不会全神贯注。
A: So what's your idea?
那么你有什么想法呢？
其他表达法：
At the same time, we'll do 15-second radio commercials 3 times a day in selected cities with large populations.
同时，我们还会在被选中的人口较多的城市的电台广播中宣传，每天三次，每次时间为15秒。
