SAT词汇技能2 - 第 17 课

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

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

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

a large waterfall where water rushes forcefully over a height

the degree of roundness exhibited by a three-dimensional object

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

a measuring tool used to determine the roundness of a curved surface

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

to leave one's own country in order to live in a foreign country

to disturb or unsettle someone, causing them to feel worried or uneasy

a disruption or disturbance of a normal state of mind or emotions

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

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

someone who spends or uses resources recklessly or wastefully

impressively great in amount or degree

a remarkable example of a particular quality, skill, or achievement

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

someone who can write or approve a law as a member of a legislative body, usually elected by people