植物群落可以自由地聚集，并且，它们的特殊结构由该区域的具体历史情况所决定。

Plant communities assemble themselves flexibly, and their particular structure depends on the specific history of the area.

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他预计他还将请求各国减缩贸易壁垒，并且在太平洋沿岸地区即刻建立双边和区域自由贸易协定。

He is also expected to seek a reduction in trade barriers, and to build on bilateral and regional free trade agreements already in place along the Pacific Rim.

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如果小对象区域中的可用自由空间量远远大于分配请求大小，但是还无法满足请求，则表明堆中都是碎片。

If the amount of free space available in the small object area is much greater than the size of the allocation request and yet the request can not be satisfied, the heap is fragmented.

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