hear of

听到，听说

heady, heal, healer, healing, health, health centre, health farm, health food, health inspector, health service, health visitor, health-care, healthcare, healthful, healthily, healthiness, healthy, heap, hear, hear from, hear of (about), hear sb. out, heard, hearer, hearing, hearing-aid, hearken, hearsay, hearse, heart, heart and soul, heart attack, heart failure, heart to heart, heart-break, heart-breaking, heart-broken, heart-lung, heart-rending, heart-searching,