无从查起
Impossible to trace
以上为机器翻译结果，长、整句建议使用 人工翻译 。
有关反应堆涡轮附近流动的放射性水的情况也是一样：对于其源头仍无从查起。
It is a similar story with the pools of radioactive water that have been found sloshing around turbines near the reactors; it is not clear where these came from either.
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