ADJ (of marsupials, such as the kangaroo) giving birth to incompletely developed offspring (有袋动物，如袋鼠)生下未发育完整的幼仔的
ADJ（形容词） (of marsupials, such as the kangaroo) giving birth to incompletely developed offspring (有袋动物，如袋鼠)生下未发育完整的幼仔的