maths
因式分解
factor
the separation of tasks in any economic system or
organisation so that participants may specialise.
division of labor
fine sand, clay, or other material carried by running water and deposited as a sediment, especially in a channel or harbour
silt
a pigment produced by the cell in epidermis to give skin color
melanin
chemical reactions break down pieces of food into smaller molecules
chemical digestion
the difference of squares formula
平方差公式
the boomerang-shaped region of the Middle East that was home to some of the earliest human civilizations.
Fertile Crescent
artificial process of applying controlled amounts of water to land to assist in the production of crops
irrigation
a tube that transports food from mouth to stomach
esophagus
which occurs when the cells of the digestive system take in small molecules of digested food
absorption
三项式
trinomial
an amount of something left over when requirements have been met; an excess of
production or supply
surplus
waves of muscular contractions that move food through the digestive tract
peristalsis
protein that helps break down large molecules into smaller molecules
enzyme
food is physically broken into smaller pieces when you chew
mechanical digestion
两项式
binomial
a complex human society, usually made up of different
cities, with certain characteristics of cultural and technological development.
civilization
最大公因数
GCF (Greatest Common Factor)
the removal of undigested food and other wastes from the body
elimination
the act of eating, or putting food in the mouth
ingestion
the perfect square formulae
完全平方公式
channels, or artificial waterways, for water conveyance, or for servicing water
transport vehicles
canals
the outermost layer of skin
epidermis
the mechanical and chemical breakdown of food into small particles
digestion
a substance that provides what is needed for plants or animals to live and grow
nutrient