| 摘要 |
A spiral bellows structure having a longitudinal axis includes at least one peak portion extending spirally around and along the longitudinal axis and at least one valley portion extending in parallel with the peak portion to thereby define a flow passage. The spiral bellows structure has a reduced flow resistance because of its tendency to suppress turbulence and eddies while allowing to keep the original characteristics, such as flexibility, of a straight bellows structure substantially unchanged.
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