"下纲"是个多义词，它可以指下纲（动物学释义）,下纲（水产学释义）。
笔者曾对挪威鲱鱼围网的下纲沉降深度在围捕作业中进行了测试。
The writer has ever measured the depths of Norwagian herring purse seine during surrounding-fishing operation.
爱珍多龙化石属于主龙形下纲，主龙形下纲包括鸟类及鳄目爬行动物，但非蜥蜴、蛇或者是龟类。
The fossil he mentions is now a member of Archosauromorpha, a group that includes birds and crocodilians, but not lizards, snakes, or turtles.
通过对实测数据和理论分析，阐述了在收绞括纲过程中围网下纲提升速度的变化规律和影响下纲提升的主要因素。
In this paper, the law of change on raising speed of leadline and main factors affecting leadline going up have been expounded by analysis to measured datum and theory.
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