动力

A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. It is a fundamental category in biological classification.

An element, feature, or factor that is liable to vary or change. In research, it is the specific thing being measured or controlled in an experiment.

Matter from which a thing is or can be made, or information/documentation used as a basis for research. It covers both physical substances and abstract data.

A small part or quantity intended to show what the whole is like. Essential for describing research methodology and statistics in IELTS.

A number or value indicating an amount or level. Used frequently in IELTS Task 1 to describe specific points on a graph or chart.

The difference between the measured value and the true value. Commonly used in academic settings to discuss limitations or accuracy in experiments.

To express doubt about the truth or validity of something; to challenge.

To move away from a standard, course, or expected path; to deviate.

To make something known or visible that was previously secret or hidden, especially a truth or a pattern.

A state of balance where all parts or elements are equal or in correct proportions. It is common in contexts like diet, economics, and ecology.