China is a mountainous country, especially in the northwest and southwest where landslides run riot because of the especially geological environments and conditions.
我国是一个多山的国家，尤其是西南、西北地区，特殊的地域环境和地质条件致使滑坡灾害肆虐。
Fluorosis badly endangers the health of the people in the southwest and northwest of China.
“氟魔”严重威胁着我国西南和西北等地人民的身体健康。
Many large hydropower stations that are being built or to be built are mostly located at the high-mountain-and-gorge areas in the southwest and northwest of China.
国内在建和待建的大型水电工程大多坐落在西南、西北高山峡谷地区。
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