The point of degradation, due to attenuation or distortion, at which a signal becomes unusable.由于衰减或失真使得信号变得不能使用的那个退化点.Mortality is the number or volume of trees periodically rendered unusable through natural causes.枯损是一...
Bombing had made roads and railways unusable.轰炸导致公路和铁路都无法通行。The point of degradation, due to attenuation or distortion, at which a signal becomes unusable.由于衰减或失真使得信号变得不能使用的那个退化点.Mortality is the number or volume of tree...