First of all, a "meltdown" is not a precisely defined term, which makes it fairly useless as an indicator of what's going on. Even the terms "full meltdown" and "partial meltdown" are pretty unhelpful, which is partly why we've written this guide--you'll be able to understand what's actually happening without relying on spurious terms that the experts themselves are often loathe to use.
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The more the fuel is exposed, the closer the reactor comes to a full meltdown.
也就是说燃料棒暴露的越多，那么越容易全部熔化。
A "full meltdown" has a more generally accepted definition than, say, a "partial meltdown."
相比“局部熔化”，“全熔化”是一个更易于接受的定义。
A full meltdown at the Japanese facility would still release radioactive gases, but those tend to dissipate in the atmosphere.
虽然日本这一核电站的核芯全部熔解仍然有可能释放出放射性气体，但这些气体往往会消散在大气里。
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