随着金矿的普遍开采应用，从难浸金矿石中提取金越来越引起国内外的广泛重视。
Extensive attentions have been attracted to the extraction of gold from refractory gold ore at abroad.
但是当人们在中风以后遇到语言听说困难——一种叫作失语症的毛病时，从难的级别开始，他们似乎进步得更快。
But when people have difficulty speaking and understanding language after a stroke-a condition called aphasia-they seem to improve faster when they start at a harder level.
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