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

多种因素的影响,即水环境特
、鱼类的生态习性、复殖吸虫的

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
止,这位旅行者一直被黛娜柔和的高音的魅力束缚在原地,这种音调具有多种变化,就像一种被音乐本能的无意识技巧所触动的精美乐器。