渐变结构碎料板 size-graded particleboard ; size-graded particle board

渐变结构刨花板 [木] size-grade particleboard

双渐变结构 Double tapered structure

渐变结构复合腔 Complex cavity with gradual transition

渐变慢波结构 Tapered Slow Wave Structure

渐进式结构变化 evolutionary structural changes

渐变锥形慢波结构 tapered slow-wave structure