在互利共生的约束中，小丑鱼一生与宿主海葵生活在一起，很少游出超过它们几米的地方。
Bound in an alliance of mutual benefit, clownfish spend their entire lives with their host anemones, rarely straying more than a few yards from them.
这种寄生虫生命周期中需要螺和鱼作为宿主，但是中国干旱地区没有这种螺和鱼。
Thee fluke needs snails and fish for its lifecycle, but there were no such snails or fish in this dry region of China.
出于互惠互利联盟的约束，小丑鱼一生与宿主海葵生活在一起，很少游出超过它们几米的地方。
Bound in an alliance of mutual benefit, clown fish spend their entire lives with their host anemones, rarely straying more thana few yards from them.
不同宿主中，杜父鱼驼形线虫的感染率、感染丰度和感染强度差异很大。
The nematode's mean prevalence, prevalence, mean abundance and intensity of infection varied in different fish species.
不同宿主中，杜父鱼驼形线虫的感染率、感染丰度和感染强度差异很大。
The nematode's mean prevalence, prevalence, mean abundance and intensity of infection varied in different fish species.
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