Peter was pretty much fine until 2007, when the glaucoma and macular degeneration that had been under control for years suddenly turned catastrophically worse.
Peter的身体状况一直不错，直到2007年他的青光眼和黄斑变性突然变得严重了。
The communities of these sand dune-fixed plants suffer severe degeneration and thus need enhanced protection, grazing control and prevention of sand dunes from becoming mobile.
固定沙丘植物群落退化严重，需要加强保护，控制放牧强度，防止沙丘活化。
There were many factors contributing to the grassland degeneration, but some were artificial control and others were not.
在造成草地退化的众多因素中，可控因素主要有过度放牧、垦殖、樵采以及政策的导向。
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