Polytrope and uncertainty of exciting surge make it difficult to identify from faults which result in malfunction of protection.
由于励磁涌流的多变性和不确定性，给基本故障的识别造成困难，因而出现保护误动。
2
The stress which acts on the plant root in the crag earth medium is very complexity and polytrope, so determining its reinforcement ability is extremely difficult.