Republic of China time Beijing ancient capital business street by large-scale business street. Conventional business street. The specialized business street shape existence has the intense time mark.
民国时期北京古都商业街以大型商业街、常规商业街、专业商业街的形态存在，具有强烈的时代印记。
A subterranean river said to be flowing beneath the Amazon region of Brazil is not a river in the conventional sense, even if its existence is confirmed.
在巴西亚马逊地区地下流动的地下河不是传统意义上的河流，即使它的存在已经被证实。
An improved BP neural network is proposed for the purpose of overcoming the slow convergence and existence of local minimum in conventional BP neural network.
先对传统的BP人工神经网络进行了分析，针对其收敛速度慢，存在局部极小值的缺点提出了一种改进后的BP人工神将网络。
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