顺向和逆向演替是边缘型旅游地两种截然不同的动态演替模式。
The favorable and the adverse operating patterns are the two different dynamic operating patterns of the peripheral tourism areas.
这种自然演替模式随着滩涂（或沙洲）淤积增高和面积的扩涨，即按高程从低到高的顺序进行。
This mode goes from low to high with the heighten of filling up and enlargement of sandbank (or tidal flat). 3.
这种自然演替模式随着滩涂（或沙洲）淤积增高和面积的扩涨，即按高程从低到高的顺序进行。
This mode goes from low to high with the heighten of filling up and enlargement of sandbank (or tidal flat). 3.
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