A large fire then broke out, engulfing several shops and spewing a cloud of gray smoke over the area.
VOA: standard.2009.10.28
it becomes a gray area but it should be pretty clear if you can treat something is reversible are irreversible.
这是个灰色区域,但什么可以当作可逆过程处理,而什么要当作不可逆过程,这是相当清楚的。
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