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。

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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。

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Envelope migration of radial target with constant acceleration was researched in chapter four.

第四章对径向匀加速目标的包络走动补偿问题进行了研究。

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My literature review suggests that most economic researchers find that, when other factors are held constant, higher taxes do indeed reduce the level of economic activity and hence migration (See What Is the Evidence on Taxes and Growth?).

FORBES: Sorry New York Times, Tax Flight of the Rich Is Not a Myth

Net migration, which tracks shifts in the population after cancelling out offsetting moves, has remained relatively constant (see chart).

ECONOMIST: Free exchange