剑桥雅思19 - 学术类 - 测试2 - 阅读 - 第2段 (3)

(chemistry) a substance formed by the chemical combination of two or more elements in a fixed ratio

to provide explanations or reasons for a particular situation or set of circumstances

to show, point out, or suggest the existence, presence, or nature of something

a relationship or connection between two or more things or people

a short reference to someone or something, often made in speech or writing without giving many details

to become aware or conscious of something

to regard or consider something in a particular way

a segment or phase of a journey or process

to admit defeat and discontinue an effort

anything that occurs alongside a particular condition or phenomenon, serving as an indication of its presence or existence

any action or maneuver taken as part of a plan or strategy to achieve a specific goal or progress toward an objective

a defining or distinctive feature of something

a piece of writing, image, etc. published online, usually on a social media website or application, or a blog

intense or extreme in impact

easy to see or notice

regularly and with short time in between

to be faced with an unexpected difficulty during a process

to experience and be affected by something bad or unpleasant

any of the separate events or series of events occurring in a sequence

to join or connect together to form a pair

a broad term encompassing various conditions affecting the heart, including coronary artery disease, heart failure, and valvular disorders

a state characterized by constant feelings of sadness, hopelessness, and a lack of enegry or interest in activities

to make sure that something will happen

to help or support the progress or development of something

used to indicate the method or channel by which something is done

a professional who studies behavior and mental processes to understand and treat psychological disorders and improve overall mental health

used to indicate a preference between two alternatives, often suggesting one option is chosen over the other

an uneasy psychological state

a mental image that is similar to a visual perception

a clear and telling mental image

to create a mental image or representation

referring to a situation in which teams, players, etc. are trying to defeat their rivals

a person of the same age, social status, or capability as another specified individual

an overall, conscious recognition or understanding of a situation, feeling, or environment

a scheduled period of teaching, instruction, or learning activities conducted within a defined timeframe

a person who takes part in sports, either professionally or for enjoyment

someone or something that is possible to cause danger, trouble, or harm

to record or keep track of the points, goals, or runs achieved by players or teams during a game or contest

a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something