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

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。

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The Van Guard Healthcare etf (VHT) declined 17%.

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