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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从木材密度、抽提物、加工性能等方面讨论人工林难胶合木材胶合困难的主要原因，阐述改善胶合性能的主要措施。

This paper first discusses factors which may affect the gluability of poor-bonding wood from wood density, extractives and machining quality aspects.

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