这表明禽流感依然具有传播扩散的可能。
This demonstrates that avian influenza still has the potential to spread.
另一些人认为白杨树只传播扩散水银，而不是把它从环境中清除。
Others believe poplar trees only spread mercury rather than remove it from the environment.
那么医生是如何防止斑疹伤寒的扩散与传播的呢？
我们说话时，声波就开始传播，向四面八方扩散。
When we speak, sound waves begin to travel and go in all directions.
我们说话时，声波就开始传播，向四面八方扩散。
When we speak, sound waves begin to travel and go in all directions.
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