A sponge of a grade of structure of the simplest type, in the form of a tube or bag lined with choanocytes.
Late 19th century: modern Latin (genus name), from Greek askos 'bag'.
Late 19th century: modern Latin (genus name), from Greek askos ‘bag’.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。