自从九十年代以来，隐喻成为认知语言学的重点研究课题之一。
Since the 1990s, metaphor has been a crucial topic in cognitive science.
生物质快速热解技术是国内外生物质资源高效利用的重点研究课题。
Biomass fast pyrolysis is a key subject on biomass high-efficient utilization both at home and abroad.
加工超光滑表面的KDP晶体是现代超精密加工技术领域的重点研究课题。
Machining KDP crystal with an ultra-smooth surface is a key subject in the field of modern ultra-precision machining.
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