这个巨大的油炸圈形(圆环形)的构筑物坐落在反应堆建筑的中心，它的标高比反应堆低。

Also known as the torus, this large doughnut-shaped structure sits in the centre of the reactor building at a lower level than the reactor.

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它有体积小、功耗低、频率变化速度快、信号指标高的特点。

It has the characteristics like small volume, low power loss, quick frequency shift and elevated signal indication.

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