propagation

Such rootstocks or cultivars were reproduced true to type by vegetative propagation.

这些钻木和品种,通过无性繁殖长成和亲本一样的类型.

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.

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

首先研究光束通过各种光学介质的传播问题.

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.

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.

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.

So far we have described the propagation of alternating magnetic fields.

至此我们讨论了交变磁场的传播.

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.

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.

Rose propagation has a long and rich history.

玫瑰繁殖有着悠久的历史。

If a plant has spotted or crinkled leaves, do not use it for propagation.

如果植物的叶子有斑点或者萎缩，就不要用来繁殖。

Clonal propagation can also give some large gains in a relatively short time.

繁殖无性系也可以在较短期间内提供较大的增益.

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.