unusable例句
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 trees periodically rendered
unusable through natural causes.
枯损是一类由于自然原因而定期变得无用的林木株数或材积.