精神病院百分之三十的床位被无固定住所的人所占用。
30 percent of psychiatric hospital beds are occupied by people of no fixed abode.
"然而，一个群体生存所占用的区域越大，在定居该地的同时开发这片区域的困难也就越大。
However, the larger the terrain used to support a group, the harder it is to exploit that terrain while remaining in one place.
释放非托管资源所占用的内存。
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