名詞 propagation:

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

1. Emission and propagation of energy in the form of rays or waves.
   發(fā)射以光線(xiàn)或波的形式發(fā)出和傳播能量
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.
   宣傳活動(dòng)對(duì)一個(gè)學(xué)說(shuō)、事業(yè)或信息的系統(tǒng)宣傳，其反映倡導(dǎo)該學(xué)說(shuō)或該事業(yè)的人的觀點(diǎn)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.
   屬一群擁有共同祖先和明顯特征的有機(jī)體，尤指屬于同一物種的一群，通過(guò)人工選擇來(lái)發(fā)展，通過(guò)有控制的繁殖來(lái)維持
4. The sun sometimes spoils the propagation of radio waves.
   太陽(yáng)有時(shí)會(huì)影響無(wú)線(xiàn)電波的傳播。

prop.a.ga.tion

n.（名詞）
Multiplication or increase, as by natural reproduction.
繁殖：數(shù)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：向更大的地區(qū)或更大的數(shù)目擴(kuò)展的過(guò)程；散發(fā)
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.
【物理學(xué)】 傳播：通過(guò)象空氣或水這樣的媒介傳播傳送的行為或過(guò)程，尤指電磁波或聲波的運(yùn)動(dòng)等干擾過(guò)程

【引伸】
prop.aga.tional
adj.（形容詞）