bolsters

He used a couple of bolsters to elevate his head.

他用两个垫枕垫头.

《简明英汉词典》

The double - row piles with both inclined and horizontal bolsters also analyzed in consideration of staged excavation.

本文亦分析了考虑开挖过程的安置斜撑与带支撑的双排桩支护结构.

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