Implacentalia
enUKIm`pla`cen`ta´li`a
| n. pl. | 1.(Zool.) A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed. |
| 单词 | implacentalia | ||
| 释义 | ImplacentaliaenUKIm`pla`cen`ta´li`a
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