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
变化趋势受多

的影响,即水环境特
、鱼类的生态习性、复

的群落结构、活物运输等。
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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,这位旅行者一直
黛娜柔和的高
的魅力束缚在原地,这种
调具有多种
化,就像一种

本能的无意识技巧所触动的精美
器。