1. The wave propagation in, perhaps, the most general model of a poroelastic medium is discussed. 讨论了弹性多孔介质中波的传播的（或许是）最一般的模型。
2. Under conditions of easterly flow, therefore, or very large westerly flow no vertical propagation will occur. 所以在东向气流或很大的西向气流的情况下，将不发生垂直传播。
3. Explants are also a means of plant propagation, producing clones and offering a more rapid means of multiplication than seed production. 组织培养也是一种植物繁殖方式，它产生克隆，提供一种比种子发芽更为快速的增殖方法。
英英解释
n.
1. the spreading of something (a belief or practice) into new regions
2. the act of producing offspring or multiplying by such production
3. the movement of a wave through a medium
