off-grade

adj.等外的，质差的

of importance, of itself, of late years, of necessity, of one's own, of the moment, of...importance, of...interest, of...value, off, off and on, off balance, off chance, off duty, off of, off(-), off-beat, off-cut, off-day, off-duty, off-handedly, off-key, off-licence, off-line, off-load, off-peak, off-putting, off-season, off-stage, off-street, off-white, offal, offbeat, offence, offence (US offense), offend, offender, offense, offensive, offensively,