ergonomics

n [sing v] study of work and working conditions in order to improve people's efficiency 工作环境改造学.

equivocal, equivocate, equivocation, ER, era, eradicate, eradication, eradicator, erasability, erase, eraser, erasure, ere, erect, erectile, erection, erectness, erector, erg, ergo, ermine, erode, eroded, erogenous, erosion, erosive, erotic, erotica, erotically, eroticism, err, errand, errant, erratic, erratically, erratum, erroneous, erroneously, error, ersatz,