noun 下载 🔗分享 蝉,知了。 Any of several insects in the superfamily Cicadoidea, with small eyes wide apart on the head and transparent well-veined wings. Examples : "During the hot summer days, the loud buzzing of a cicada filled the air outside. " 在炎热的夏天,外面到处都是知了响亮的叫声。 insect animal biology nature organism ecology 与AI对话词汇游戏阅读练习