她54岁了，精力和气色都非常好。At 54 years old her energy and looks are magnificent.我们必须首先集中精力治疗毒瘾。We must concentrate our energies on treating addiction first.他们把精力集中在减轻难民们的苦难上。Their energies were focussed on the alleviation of the re...
How such extensive damage could have been sustained so quickly remains unexplained.如何这么快就造成这么大的破坏依然不得而知。He died in unexplained circumstances.他死因不明。Soon after leaving Margate, for some unexplained reason, the train was br...