The displacement current mechanism is operative only for capacitors under reverse bias or very weak forward bias conditions which maintain a space-charge layer .
位移电流的机理只对反向偏压或要维持空间电荷层所需要的非常弱的正向偏压条件下的电容器才有用。
Current surgical methods still have high difficulties and risks, and intra-and post-operative complications must be carefully monitored and managed.
手术的难度和风险较大，术间和术后需要认真控制并发症。
Current surgical methods still have high difficulties and risks, and intra-and post-operative complications must be carefully monitored and managed.
手术的难度和风险较大，术间和术后需要认真控制并发症。
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