the total accumulation of beliefs, customs, values, behaviors, institutions and communication patterns that are shared, learned and passed down through the generations in an identifiable group of people.
计算机问世至今已经历四代，而划分成四代的主要依据则是计算机的()。
pn结正偏时，多子的扩散加强，形成较大的扩散电流，pn结处于导通状态。
买卖双方为解决争议而提请仲裁时，必须向仲裁机构递交仲裁协议，否则，仲裁机构不予受理。()
in summary writing, the thesis statement, which is the central idea of the original text, is always given as the first sentence, followed and supported by the key points.