The shark described a circle around the shoal of fish.
这条鲨鱼围绕着鱼群游动。
《牛津词典》
2
Recent research had shown that fish recognised individual "shoal mates", social prestige and even tracked relationships.
最近的研究表明鱼可以识别各自的“鱼群伙伴”、社会威望，甚至相关的人际关系。
3
Agrillo's team found that mosquitofish can discriminate between numbers up to 16, but only if the ratio between the fish in each shoal was greater than 2:1.