| 释义 |
〔aplacental〕Having no placenta, as marsupials and monotremes.无胎盘的:无胎盘的,如有袋目哺乳动物和单孔目动物〔marsupial〕Any of various nonplacental mammals of the order Marsupialia, including kangaroos, opossums, bandicoots, and wombats, found principally in Australia and the Americas.有袋(目)动物:有袋目的无胎盘哺乳动物的一种,包括袋鼠、负鼠、袋狸和毛鼻袋熊,主要生活在澳大利亚和美洲 |