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

趋势受多
因素的影响,即水环境特
、鱼类的生态习性、复殖吸虫的群落结
、
运输等。
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Hitherto the traveller had been chained to the spot against his will by the charm of Dinah's mellow treble tones, which had a variety of modulation like that of a fine instrument touched with the unconscious skill of musical instinct.
到目前为止,
位旅行者一直被黛娜柔和
高音
魅力束缚在原地,
种音调具有
种
化,就像一种被音乐本能
无意识技巧所触动
精美乐器。