- under layer
- 垫层: bed course; undercourse; cus ...
- 层: I storey; tier; stratum
- 层层: layer upon layer; ring upon ring; tier upon tier
- 垫层: bed course; undercourse; cushion; packing; bedding course; cushion course; subcrust; cushion coat; cushion ply; mat base◇垫层橡胶 cushion rubber
- 衬垫层: bedding; laying; sarking
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