Separation anxiety disorder is the child or adolescent's excessive worry and apprehension about being away from their parents. Children with separation anxiety disorder often fear that their parents will be harmed in some way or will not return to them as promised.
fine adjective or adverb. It's an adjective functioning as a Predicative Complement. A Predicative Complement is a Complement of the verb that describes the Subject or Object. In this case it is describing the Subject. Predicative Complements can be noun phrases, adjective phrases and preposition phrases, but hardy ever - if ever at all - adverbs. The reason we use an adjective phrase here is that this phrase is describing a noun phrase. Modifiers of noun phrases are usually adjectives, not adverbs. Consider the following examples: I'm happy. I'm cold. I'm assiduous. *I'm happily. (adverb as PC, ungrammatical) *I'm coldly.
With coarse, a small movement results in a large jump, while the opposite is true in fine. Another difference between coarse and fine adjustment is the range that they have. The coarse adjustment covers the entire range from minimum to maximum. In contrast, the fine adjustment only covers a fraction of the entire range. The bare minimum range for the fine adjustment is the discrete step increment of the coarse adjustment, in order to cover the entire range. It can also be larger, depending on the designer of the device.