therein

ad.在那里，在那时；在那点上；在其中

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