However, there is no data demonstrating that liver resection before LT, which can be used either as a bridge treatment or as a primary treatment, improves the survival after LT.
但是，目前还没有数据显示，作为一个过度或者初步的治疗，肝移植前进行肝切除是否可以改善移植后的存活率。
Because of the complex structure of slot, theoretical analysis is very difficult and most of the slot designs are depend on the experimental data. lt takes long design circle and great expense.
由于结构的复杂性，理论计算难度较大，波导窄边缝隙天线的设计多数依赖实验数据，设计所花费的时间较长。
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