If water levels fall in summer, as they do in most of North America, then beavers lodge entrances may be exposed.

如果夏季水位下降，就像在北美大部分地区所发生的那样，那么海狸居所入口可能会暴露。

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If water levels fall in summer, as they do in most of North America, then beavers' lodge entrances may be exposed.

如果像北美大部分地区一样夏季水位下降，那么海狸的小屋入口就会暴露出来。

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For jelly tube blasting, running furnace water levels fall.

给水母管爆破时，运行炉水位下降。

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Some scientists also worry that water levels will fall permanently.

ECONOMIST: Environmental management faces moving targets

Meteorologist Jeff Masters notes today that although the storm surge has pushed salt water from the Gulf as far as 314 miles upstream, all the rain expected to fall north of New Orleans in the coming days will help raise near record-low water levels on the river and flush the salt water back out.

FORBES: Levee Breach Floods 800 Homes In Louisiana, And Other Notes From Isaac's Landfall