a sudden or disastrous event that destroys or changes a whole region or system

カタクリズム, 大災害

a person, thing, or event that provokes or accelerates change or activity by introducing new perspectives or actions

触媒, 変化の要因

a large weapon that was used in ancient times to throw stones or other objects with great force

カタパルト

(geometry) a round 3D shape like a ball that is slightly flattened at the top and bottom points

球体, 楕円体

someone who moves from one country to another with the intention of settling there permanently

移民, 移住者

to temporarily stitch two pieces of fabric together with long, loose stitches that can later be easily removed

仮縫いする, 仮縫いする

a fortified structure extending from a wall, typically angled, for defensive purposes

バスティオン

an individual, often a leader or authority figure, who possesses the power to create laws, particularly not directly elected by the people

立法者, 法律制定者

