hygiene

n．卫生学，卫生的

hydrate, hydration, hydraulic, hydraulically, hydraulics, hydrocarbon, hydrochloric, hydroelectric, hydroelectrically, hydroelectricity, hydrofoil, hydrogen, hydrogen bomb (also H-bomb), hydrogen peroxide, hydrometer, hydrophobia, hydroplane, hydroponics, hydrotherapy, hyena (also hyaena), hygienic, hygienically, hymen, hymn, hymnal, hyp-, hypo-, hype, hyper-, hyperactive, hyperactivity, hyperbola, hyperbole, hyperbolic, hyperbolical, hypercritical, hypercritically, hypermarket, hypersensitive, hypersensitivity, hypertension,