Japan's nuclear safety agency has estimated the accident at Fukushima at level four.
日本的核安全机构估计第四级在福岛事故。
At a high level, an ESB has four major functions.
概括地讲，ESB具有四个主要功能。
At the business level, there are four adaptive strategies.
在事业层存在四种适应战略。
At the street level are parking and entrance lobby; above are four stacked units.
在街道这一层的是停车场和入口大厅，其上是四个堆积的单元块。
The four barriers to device adoption remain: high cost at the device level;
这四个障碍装置采用保持：成本高在设备级别；
The four barriers to device adoption remain: high cost at the device level;
这四个障碍装置采用保持：成本高在设备级别；
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