To infold or become infolded so as to form a hollow space within a previously solid structure, as in the formation of a gastrula from a blastula.是什么意思_To infold or become infolded so as to form a hollow space within a previously solid structure, as in the formation of a gastrula from a blastula.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句