生态系统

To calculate, estimate, or figure out something using data, logic, or mathematical methods. It implies a process of reasoning from known facts to unknown values.

To release, set free, or emit. It can refer to letting a person go, releasing energy in a chemical reaction, or emitting gases.

To settle as sediment; the process of forming a solid in a liquid solution or the accumulation of historical experience.

A small compact body, such as a grain or a tiny piece of matter.

The throwing back by a body or surface of light, heat, or sound without absorbing it; or a serious thought or consideration.

The branch of biology that deals with the normal functions of living organisms and their parts.

To make a liquid thinner or weaker by adding water or another solvent; to decrease the concentration of a substance.

The wear away or change the appearance or texture of something by long exposure to the air, weather, or chemicals. A key concept in geology passages.

The curved path of a celestial object or spacecraft around a star, planet, or moon; also a track or a fixed course.

To become weaker or less intense; to reduce the strength or power of something.