When covered by your hand , this antenna suffers from attenuation .
当你用手覆盖了这个点，天线信号就会衰减。
The opposite of amplification , attenuation happens whenever a signal is obstructed .
信号在遇到阻碍时就会衰减，而不是放大。
In vivo experiment using mouse model has demonstrated that the mechanism of viral attenuation arising from this mutation may be responsible for the change in tissue tropism .
利用小鼠作为动物模式则证实该突变病毒减毒的机制在於病毒的组织趋向性改变所致。
Understanding attenuation and signal loss .
了解衰减和信号丢失
All antennas - including television , radio , gps , and cellular antennas - can experience attenuation .
