Micropropagation is used for the mass clonal propagation of elite lines or disease-free planting material.
微繁殖被用于优良品系或无病害种植材料的大规模无性繁殖。
Aristotle (384-322 BC) recognized the need for a conducting medium and stated that the means of propagation depended on the properties of the material.
亚里士多德(384 BC - 322bc)认识到传播媒介的重要性，并指出声传播的方式取决于材料的特性。
The model of wave propagation in functionally graded material (FGM) is introduced to soil medium, and the concept of functionally graded soil medium is brought forward.
研究了将功能梯度材料中应力波传播的计算模型应用到土介质中，提出了梯度土介质的概念。
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