Scientists have responded by noting that hungry bears may very well be congregating聚集 all over human settlements, leading to the illusion错觉 that populations are bigger than they actually are.高的; 高度为…的; 富含…的; 重要的; 显赫的; 先进的; 全盛的; 不新鲜的; 崇高的; 兴奋的; 有醉意的When vaccination pre