Examlex
Beijing lifted import restrictions in 1978 under its open-door policy recognizing China's need for exposure to Western products, ideas, and capital.
Carbon Dioxide
An odorless, colorless gas that comes from the combustion of carbon and organics, plus through respiration, and is captured by plants in their photosynthesis process.
Ice Cores
Cylindrical samples taken from ice sheets or glaciers, used in climate research to analyze past atmospheric and environmental conditions.
Theory of Atoms
A scientific theory that matter is composed of discrete units called atoms, which are the basic building blocks of chemical substances.
Law of Definite Proportions
A chemical law stating that a compound always contains exactly the same proportion of elements by mass.
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