Indoors, radon levels are higher, with highest levels found in places such as mines, caves and water treatment facilities.

室内的氡水平较高，而矿山、岩洞和水处理设施等地方的氡水平最高。

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Derived from Shuttle Radar Topography Mission (SRTM) data, the white line around the valley in the top image approximates the Lake Suguta shoreline when water levels were at their highest.

根据航天飞机雷达地形测绘数据，上图中山谷周围的白线近似于苏加塔湖水位最高时的湖岸线。

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South Africa raised the flood-warning level for its central Orange River area today as water levels in places were expected to reach the highest since 1996.

南非提高了洪水警报级别，奥兰治河水位已经达到了自1996年已来的最高位。

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Late this morning was high tide along much of the coast, and the highest water levels of Isaac are likely being experienced at many locations.

FORBES: Hurricane Isaac and New Orleans: It's All About Water

The recharge is unprecedented and is the highest increase in water levels ever recorded in our area at this time of year.

BBC: Hosepipe bans: Final four companies lift restrictions

This evening, as the core of Sandy moves ashore, the storm will carry with it a gigantic bulge of water that will raise waters levels to the highest storm tides ever seen in over a century of record keeping, along much of the coastline of New Jersey and New York.

FORBES: Hurricane Sandy's Storm Surge: A Preview of Things to Come