noun 下载 🔗分享 腹足纲动物,单壳贝。 A univalve mollusk or its shell. Examples : "The children collected colorful univalves on the beach, carefully placing them in a bucket. " 孩子们在沙滩上捡拾着五彩缤纷的腹足纲动物的贝壳(单壳贝),小心翼翼地把它们放在桶里。 animal ocean biology 与AI对话词汇游戏阅读练习