Either way, the bubbles must have formed only within the last 10 million years and perhaps much more recently.

不论怎样，气泡结构肯定是在过去一千万年内或者更近的时期形成的。

youdao

Either way, the bubbles must have formed only within the last 10 million years and perhaps much more recently.

不论怎样，气泡结构肯定是在过去一千万年内或者更近的时期形成的。

youdao