“仍有情况处于未知状态，”他说，“我们不知道它的面积有多大？

"There is still a lot we don't know, " he said.

youdao

说，有一点，等到人类祖先出现时，欧亚大陆的大片地区还处在未知状态，或者只有部分经过努力的先驱者才知道。

For one thing, Slimak said, when it comes to human ancestral species, "large parts of Eurasia remain largely unknown, or known only by the efforts of some pioneering researchers."

youdao

说，有一点，等到人类祖先出现时，欧亚大陆的大片地区还处在未知状态，或者只有部分经过努力的先驱者才知道。

For one thing, Slimak said, when it comes to human ancestral species, "large parts of Eurasia remain largely unknown, or known only by the efforts of some pioneering researchers."

youdao