used to form adjectives showing the main place or area in which something or someone works, lives, or does business

a Manchester-based company 总部设在曼彻斯特的公司

community-based programs 以社区为活动中心的项目

used to form adjectives describing the main thing from which a particular substance or object is made

This is a cream-based sauce. 这种酱以奶油为主要成分。