单元剧： unit plays. I think you definitely know what 连续剧 (TV) ( drama) serials and 系列剧 (TV) (drama) series are, then it's easy to explain what unit dramas/plays are. A series of unit dramas/plays are some dramas each of which has its own characters and story, diffent form every other's. They have some common qualities, for example, by the same author, or of the same theme, or reflecting the features of the same place and the same age, etc. Some unit dramas produced in the mainland China are '春风沉醉的晚上 The Spring Fever/ The Intoxicating Spring Nights'，including five independent short TV stories , ' 城市的B面 The Side B of the City', and ' 人虫儿 The Human Worms'.

单元剧不是连续剧，连续剧是整个剧是有联系的一个整体，故事是可以串联的。而单元剧则是每一集或每一个单元都自成体系，每个单元都有独特的情节等。

We seldom say 单元剧

没听过“单元剧”，只听过“连续剧”这个词。

As a well-educated native Chinese speaker, I never heard of 单元剧, i don't know where you heard that.