propagation

名词 propagation:

1. the spreading of something (a belief or practice) into new regions
   同义词：extension
2. the act of producing offspring or multiplying by such production
   同义词：generation, multiplication
3. the movement of a wave through a medium

1. Emission and propagation of energy in the form of rays or waves.
   发射以光线或波的形式发出和传播能量
2. The systematic propagation of a doctrine or cause or of information reflecting the views and interests of those people advocating such a doctrine or cause.
   宣传活动对一个学说、事业或信息的系统宣传，其反映倡导该学说或该事业的人的观点和利益
3. A group of organisms having common ancestors and certain distinguishable characteristics, especially a group within a species developed by artificial selection and maintained by controlled propagation.
   属一群拥有共同祖先和明显特征的有机体，尤指属于同一物种的一群，通过人工选择来发展，通过有控制的繁殖来维持
4. The sun sometimes spoils the propagation of radio waves.
   太阳有时会影响无线电波的传播。

prop.a.ga.tion

n.（名词）
Multiplication or increase, as by natural reproduction.
繁殖：数目增加或增多，比如天然生殖
The process of spreading to a larger area or greater number; dissemination.
蔓延：向更大的地区或更大的数目扩展的过程；散发
Physics The act or process of propagating, especially the process by which a disturbance, such as the motion of electromagnetic or sound waves, is transmitted through a medium such as air or water.
【物理学】 传播：通过象空气或水这样的媒介传播传送的行为或过程，尤指电磁波或声波的运动等干扰过程

【引伸】
prop.aga.tional
adj.（形容词）