He came across the jawbone of a 4.5 million-year-old marsupial.
他偶然发现了一个450万年前的有袋动物的颌骨。
《柯林斯英汉双解大词典》
2
This marsupial inhabits the deserts of central Australia where the onset of rains and the resulting sudden growth of vegetation are extremely unpredictable.
这种有袋类动物生活在澳大利亚中部的沙漠中，那里的降雨和植被的突然生长是极其不可预测的。
3
A University of Muenster team drew up a marsupial family tree based on DNA.