mostly ad

What that really meant was that development took place on a mostly ad hoc basis.

这就意味着此次的开发建立在了一个特别的基础上。

The script was not completely prepared when filming began, since the filmmakers were more focused on the story and the action, so the dialogue was mostly ad-libbed throughout filming;

电影开拍之时本片的剧本还没有写完，因为摄制人员更关注于电影的故事和动作场面，所以大部分的台词都是在拍摄过程中即兴发挥的；

The company had done TV ads prior to that (starting with the AD based on George Orwell's "1984" during the 1984 Super Bowl), but mostly in conjunction with print campaigns.

该公司在此之前也曾做过电视广告，(从1984年的超级杯开始——乔治·奥威尔的“1984”)，但主要广告还是集中在印刷广告上。