Three years after the Sichuan earthquake, the disaster zone remains perilously unstable as expanding mines and hasty reconstruction aggravate geological risks, writes Wang Tao .
汶川震区重建三年以来，泥石流、塌方等次生灾害在扩大，主要原因之一是重建工程和工矿企业新、扩建造成的二次破坏。 汪韬报道。
In the course of alteration, the unstable elements in supergene zone are leached out in quantity, but the stable ones are relatively enriched.
在蚀变过程中，那些在表生条件下不稳定或较不稳定的元素大量流失，而那些稳定或较稳定元素则很少流失或相对富集。
The air is rather unstable near the moisture frontal zone.
同时有很强的湿度锋区，大气处于不稳定状态。
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