ought

aux.& v.应该，应当 (to do)

osteopathy, ostler, ostracism, ostracize, ostracize, ostracise, ostrich, OT, other, other from, other than, other-directed, other-worldly, others, otherwise, otiose, otter, ottoman, OU, oubliette, ouch, ought to, Ouija, ounce, our, ours, ourselves, oust, out, out of, out of breath, out of control, out of danger, out of date, out of debt, out of doors, out of favour, out of focus, out of order, out of place, out of power,