泛滥之谜 12-英语听力

[00:00.02]The tropical sun burns off the Nile's shallow waters [00:03.81]leaving a shifting mosaic of pools and new grassland. [00:08.71]Now it's time for the Dinka to return. [00:12.16]But others fare less well as the land re-emerges. [00:16.14]This catfish could easily find itself stranded [00:20.22]but it has a curious ability that might just save it. [00:24.22]If it can't swim, it'll crawl. [00:28.26]Specially adapted fins allow the catfish to walk on its elbows. [00:32.85]Like the lungfish, it can also breathe air. [00:36.35]It may have to perform this trick many times [00:38.67]as its habitable world gets smaller by the day. [00:41.91]Meanwhile, the kob are on the move again. [00:45.51]Their world is expanding rapidly. [00:47.61]As the floodwaters recede [00:49.51]a huge green carpet of new grass rolls out before them. [00:53.43]This explains how the Sudd can support such massive herds.