Economical circumstances, propagation conditions and so on in China and the United States in later of 20'th century have important effect on the dominant ideas development.
中美20世纪后期的经济环境、传播条件等因素对中美广告设计主导观念演变具有重要影响。
This study reveals not only the technique of propagation of P. ensiformis with spores for horticulture but also the proper conditions for molecular biology, genetics and systematics study.
该研究为园艺学研究提供了用孢子人工繁殖剑叶凤尾蕨的方法，也为分子生物学、遗传学和蕨类植物系统学研究提供了基础。
It could be controlled under some conditions. Controlled beam becomes mode which is unchanged propagation in linear media.
在一定条件下它是可控的。受控成模后在线性介质中传播保持其模不变。
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