The change trend was influenced by several reasons such as the aquatic habitat, the ecological characteristics of fish, the community structure of digenetic trematodes and import of live fish.
这种变化趋势受多种因素的影响，即水
点、鱼类的
态习性、复殖吸虫的群落结构、活物
输等。
The change trend was influenced by several reasons such as the aquatic habitat, the ecological characteristics of fish, the community structure of digenetic trematodes and import of live fish.
这种变化趋势受多种因素的影响，即水点、鱼类的态习性、复殖吸虫的群落结构、活物输等。
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