Fourth generation reactors have better ways of dealing with "afterheat, " heat created by leftover radioactivity in a reactor, and could circumvent the problem completely.
第四代核反应堆采用更为先进的方法处理“残热”，且能彻底绕开此问题。 残热产生自反应堆中残余的放射能。
An even bigger problem is the firms' own holdings of leftover, unsold commercial-mortgage-backed securities.
更大的问题是投行手中未卖出的此类证券。
A bigger problem may be the leftover brine, which typically contains twice as much salt as seawater and is discharged back into the ocean.
更大的问题也许是卤水废液，它的含盐量一般是海水的两倍，而且通常直接排入海洋。
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