A crocodile eats a young injured wildebeest during the great migration in the Mara River in Kenya which is infested with crocodiles lying in wait to kill.

角马跨越肯尼亚马拉河进行大迁徙时，河中会有许多鳄鱼出没，伺机而动。图中，一只鳄鱼吃掉了队伍中一只受伤的年幼角马。

youdao

On the basis of migration of seasonal frozen soil, simulates the Yellow River Source Region's runoff by snowmelt runoff model and tank model.

根据流域特点，在考虑季节性冻土的运移状况下，采用融雪径流模型与水箱模型相结合的方法，在整个黄河源区进行模拟。

youdao

Based on simulated experiment research, this paper discussed the migration rules and transformation mechanism of nitrobenzene in aquifer under the condition of groundwater recharged by river.

本文通过室内模拟实验，探讨在河流入渗补给地下水的条件下，硝基苯在含水层中的迁移规律及其转化机理。

youdao

Similarly, the elimination of Sandstone Dam on the Kettle River in Minnesota opened 30 miles for fish migration and revived recreation in the area.

CNN: Study opens floodgates on dam removal

Since there is little scientific data on the survival within estuary and ocean habitat, conservationists say recovery efforts should target the migration corridor, which has been greatly impacted by the four lower Snake River dams.

CNN: Dam removal: Too little, too late for salmon?