词汇网络: constant

Not any of a group of people or things. It represents zero or a total lack of something that was mentioned or is being discussed.

Continually or regularly over a long time.

(chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)

(physics) the universal constant relating force to mass and distance in Newton's law of gravitation