That's partly because the organs that did the work of breathing -- either gills or lungs -- don't fossilize well.
这在一定程度上是因为负责呼吸的器官——鳃或肺——没有很好地变成化石。
单词 | work of breathing |
例句 |
原声例句
PBS地球-动物趣闻 That's partly because the organs that did the work of breathing -- either gills or lungs -- don't fossilize well. 这在一定程度上是因为负责呼吸的器官——鳃或肺——没有很好地变成化石。 |
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