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# Define propagation trend
# light wave propagation
# wave front propagation
# radio wave propagation
# sound wave propagation
# Types of diffusion direction
# Does history have a certain direction?
# Antennas and wave propagation
# Antennas and wave propagation are practical
# radio propagation
# propagation time
# Applications of rectilinear propagation of light
# sound propagation method
# propagation stage
# Environment, propagation and flowering
# The propagation of radio waves in space
# Fertilization and seed propagation
# Propagation range
# propagation mechanism
# Environment, propagation areas and season
