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擅自占用空地者
A squatter is someone who occupies unused land, either to farm it or to build a house on it, without having a legal right to do so.
例句
When they returned to Tuol Sakor, they found all the best land taken by squatters.
当回到图尔沙科尔时，他们发现那些最好的土地全都被人侵占了。