他们实际上在观测鱼向上游的迁移活动。

They actually monitor the movement of the fish going up river.

《柯林斯英汉双解大词典》

羌人，最初活动于黄河中上游地区。

Qiang originally lived along the middle and upper reaches of the Yellow River.

youdao

羌人，最初活动于黄河中上游地区。

Qiang originally lived along the middle and upper reaches of the Yellow River.

youdao