In other cases, the finer particles may be removed, while the sand-sized particles are accumulated to form mobile hills or ridges of sand.
在其他情况下，较细的颗粒可能被除去，而沙粒大小的颗粒堆积起来形成移动的山丘或沙脊。
Knowledge about the wider picture of trafficking can be accumulated only over time and gleaned from a detailed and dedicated approach to the cases of individual victims.
只有通过长时间对案件受害者进行细致、专注地接触并加以积累，才能有助于我们对贩卖人口的情况进行详细的了解。
In extreme cases, the system could run out of disk space from the sheer volume of old accumulated artifacts.
在极端的情况下，由于累积大量旧的构件，系统可能会用尽所有的磁盘空间。
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