atomic weight

cause or source of a disease, pathogenesis, etiology

Clipping of 原子力発電所 (genshiryoku hatsudensho, “nuclear power plant”). / Clipping of 原子力発電 (genshiryoku hatsuden, “nuclear power generation”).

(medicine) occur primarily in

(seismology) hypocenter / (figuratively) The geographical area in which an ongoing disaster, illness, crisis, or other destructive event is currently most severe.

limit, restrict / qualify

to limit, to restrict

oath, declaration

declare publicly

river source, headstream, headwaters / source of something such as a civilization or culture