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
影响,

境特
、鱼类

习性、复殖吸虫
群落结构、活物运输等。
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Crash Course
生英语 2025年3月合集
习小贴士 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,这位旅行者一直被黛娜柔和的高音的魅力束缚在原地,这
音调具有多

,就像一
被音乐本能的无意识技巧所触动的精美乐器。