The phrase "continual source" refers to something or someone that provides a continuous supply or flow of something over time without interruption. Full definition
Maybe it's really about providing a landscape where curiosity takes root, growing a unique, vibrant, continual source of knowledge. (edutopia.org)
«The entrance of inorganic nutrients associated to SGD can be particularly relevant for the marine ecosystems of coastal areas located further away from river mouths, since SGD may be the only continual source of inorganic dissolved compounds reaching the sea in such areas,» explains Jordi Garcia - Orellana, UAB researcher and co-author of the study. (sciencedaily.com)
Fibers may also have become attached to interior furnishings that would serve as a nearly continual source of asbestos exposure. (baronandbudd.com)