We first take up the subject of optic ray propagation through a variety of optical media.

Propagation of virus in embryonating eggs was first used by Goodpasture and Woodruff in 1931.

1931年Goodpasture和Woodruff首次应用鸡胚培养病毒.

Also, the idea of progress and its enthusiastic propagation may have some effect.

还有, 进步观念及其热烈宣传也会产生某种效果.

The simplest explanation of aberration is the analogy of light propagation to the fall of raindrops.

对光行差的最简单的解释,是把光的传播同雨点的下落作类比.

Diseases spread by insects are encouraged when climatic conditions propagation of the vector.

当气候条件适于媒介昆虫繁殖时,由昆虫传播的疾病即行蔓延.

It is the reverse of the propagation step in addition polymerization.

这一过程是加聚反应历程中链增长步序的逆过程.

A complete study of the propagation of shock waves in elastic solids is presently lacking.

关于弹性固体中冲击波的传播,目前还缺少全面的研究.

Crack propagation usually begins slowly.

裂纹的增长常常是开始缓慢.

Efficient methods of vegetative propagation and improved screening techniques are also required.

高效率的无性繁殖法和改良的鉴定技术也属必需.

The method is a direct simulation of the actual process of radiation propagation.

这种方法是辐射传输实际过程的直接模拟.

Rose propagation has a long and rich history.

玫瑰繁殖有着悠久的历史。

The Security Descriptor Propagator is waiting for a propagation event.

安全描述符传播程序正在等待传播事件.

Yang Yu lin was a famous bourgeois democratic revolutionist and propagator.

杨毓麟是辛亥革命时期杰出的资产阶级民主革命家、宣传家.

Friendship knows no boundaries; therefore it is the real , true propagator of peace.

友谊无界限, 因为它是真正和平的传播者.

The Security Descriptor Propagator has been notified of waiting propagation events.

安全描述符传播程序已经被通知要等待传播事件.

A " vegetative propagule " is any type of vegetatively propagated tree.

“ 营养繁殖体 ” 是无性繁殖树木的任何类型.

...a propane gas cylinder.

丙烷汽缸

Crews were cautious though because propane tanks were resting on the roof.

虽然因为房顶上有装有化学炳的桶,消防队员们在工作时还是表现得小心翼翼.

The situation of hydrogen production from propane is summarized.

摘要综述了丙烷催化转化制氢的国内外发展状况.

How come we've been using propane, and nobody knew?

为什么我们实际上已经在使用丙烷, 但是确没人知道?

The bomb in the sport utility vehicle included propane tanks, gasoline and fireworks.

多功能运动休闲车里面的炸弹包括丙烷罐, 汽油和烟火.