与当地的土地管理人员确认，并仔细研究地图和天气状况，能减少风险。
Checking with local land managers and studying maps and weather conditions can contribute to a low-risk existence.
译：他们在离开之前就仔细研究了这个国家的地图。
They ____had studied_____ (study) the map of the country before they ___left_____ (leave).
译：他们在离开之前就仔细研究了这个国家的地图。
They ____had studied_____ (study) the map of the country before they ___left_____ (leave).
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