In America, environmental study has reached a better level. Some progresses have also been reached in China, which are advantageous factors for the study of regional environmental history.
美国的环境史学比较发达，我国国内的环境史学也有一定进展，这是区域环境史研究的有利条件。
The environmental study or report covers many factors, including noise generation, air pollution, disturbance of areas traversed, destruction of existing housing, and possible alternate routes.
环境研究或报告包括了许多因素：噪音的产生、空气污染、对被穿过区域的干扰、原有房屋的毁坏、和可能供选择的线路。
The environmental study or report covers many factors, including noise generation, air pollution, disturbance of areas traversed, destruction of existing housing, and possible alternate routes.
环境研究或报告包括了许多因素：噪音的产生、空气污染、对被穿过区域的干扰、原有房屋的毁坏、和可能供选择的线路。
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