The result turns out that the constant velocity medium migration equation is only a special case as the conclusion drawn in the paper stated.
结果表明，恒速介质偏移方程仅是本文所得结论的一种特例。
2
However, severely impacted by intensive human activities, species resources in Yangtze River have been on constant decline, and the situation of migration species is among the worst.
由于人类活动的影响，长江大批物种资源持续衰退，而洄游性物种的衰退尤为严重。
3
Envelope migration of radial target with constant acceleration was researched in chapter four.