Herd

herd cats herd behaviour herd instinct [医] 群集本能 herd path herd immunity [医] 群体免疫 herd boar herd together 成群 herd paths herd behaviours herd immunities herd mentality herd mentalities herd boars ride herd on 骑在马上看管（牛群）, 管理, 监督 thundering herd problems