七百万年来，他们作为大自然的一部分在这个星球上生活。

For seven million years they lived on the planet as part of nature.

youdao

即有一部分在这里，有一部分不在这里。

Not all the students are here. Some students are here.

youdao

即有一部分在这里，有一部分不在这里。

Not all the students are here. Some students are here.

youdao