Four of the world's 10 biggest freshwater fish migrate up the Mekong to spawn.

世界十大大型淡水鱼中有四种会迁移至湄公河产卵。

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Sea levels shot up nearly 400 feet, flooding coastal settlements and forcing people to migrate inland.

海平面上升了近400英尺，淹没了沿海居住地，迫使人们向内陆迁移。

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Any preserves we set up to protect endangered species may become useless as the species are forced to migrate along with their natural homes.

我们为保护濒危物种而建立的任何保护区都可能变得毫无用处，因为这些生物被迫随着它们的自然栖息地迁移。

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This allowed natural gas to migrate up the hole and explode at the surface.

FORBES: The Fracking Solution Is A Good Cement Job

The Angling Trust said it was disappointed after none of 72 fish electronically tagged negotiated the barrage to migrate up river to spawn.

BBC: Fears over Tees Barrage impact on fish

What is more, it may well be wrong to assume that if planning permission is denied for offices and houses in the south, jobs will migrate up north.

ECONOMIST: Straddling the great divide | The