e-tutorWiktionary 原文构词拆分e-前缀(no longer productive) Used to form terms with the sense of something being absent, being removed, or moving outward.+tutor词根/词干词源说明From e- + tutor.释义（英文）名词 NounA tutor involved in e-learning.词族派生词（2）e-tutoringe-tutorship