森林能起防御沙漠灰沙的作用。
有几次苏里曼的车消失在灰沙中，等我再看见他时，他只在我前面几英尺。
Several times Suleiman disappeared behind a veil of dust, only to emerge out of the cloud just a few feet ahead of me.
由于现代珊瑚礁的堆积速率大于地壳沉降速率，可能会形成更多的灰沙洲或灰沙岛。
However its present accumulation rate surpasses its subsidence rate, resulting in the accumulation of more lime-sand islets.
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