therefor

adv.为此

theorem, theoretical, theoretically, theorist, theorize, theorize, theorise, theory, theosophical, theosophist, theosophy, therapeutic, therapeutically, therapeutics, therapist, therapy, there, there and then, thereabouts, thereafter, thereby, therefore, therefrom, therein, thereinafter, thereof, thereon, thereto, thereunder, thereupon, therewith, therm, therm(o)-, thermal, thermal capacity, thermionic, thermionic valve (US ,thermionic `tube), thermocouple, thermodynamics, thermoelectric, thermometer,