Twenty-three years later marine biologists studying elasmobranch ( the subclass of cartilaginous fishes that include sharks skates and rays ) animals employ satellite tracking genetic analysis and high-definition cameras to broaden their knowledge of shark biology and behavior .

二十三年后的今天，海洋生物学家使用卫星定位和基因分析来研究板鳃亚纲类生物（软骨鱼类亚纲，包括各种鲨鱼和鳐），用高清摄像机来公布生物学发现和鲨鱼习性。