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.
这一过程不断继续的同时，瀑布亦向上游移动。
This one process is ceaseless continual at the same time, chute also upstream is mobile.
从海洋向上游到河流中，并在淡水中产卵的。用于指鱼。
Migrating up rivers from the sea to breed in fresh water. Used of fish.
我们的船向上游驶去。
我们的船向上游驶去。
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