重点抽样技术是一种方差减少技术，它能显著地减少运算时间。

So Importance Sampling simulation is used to reduce the time of simulation.

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在此基础上，采用分层抽样技术和综合评价法，构建了基于车辆行驶时间（VHT）加权的分层次交通拥堵指数（TCI）模型。

Then, a weighted vehicle-hours-traveled (VHT) based traffic congestion indices (TCI) model was developed by using stratified sampling and comprehensive evaluation method.

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