n.（单复同）系列；丛书；连续
The theory is based on a series of wrong assumptions. 这一理论是以一系列错误的设想为依据的。
He published a new series of readers for students of English. 他出版了一套新的英语学习丛书。
After a series of unsuccessful attempts, he has finally passed the driving test. 经过连续几次的失败，他最后终于通过了驾驶考试。
series是可数名词,单复数同形。
