The timber is graded according to its thickness.
木材按厚度分级。
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总)
告》
最新合辑 Hit by a magnitude-9.0 earthquake and an ensuing tsunami on March 11, 2011, the plant suffered core meltdowns that released radiation, resulting in a level-7 nuclear accident, the highest on the International Nuclear and Radiological Event Scale.
2011 年 3 月 11 日,在 9.0
地震和海啸的袭击下,福岛第一核电厂发生堆芯熔毁,放射性物质外泄,该事故被定为核事故最高分
7
。
英语短文