- 硬性: hardness; rigid; stiff; infl ...
- 管: pipe; tube
- 硬性管脉冲器: hard tube pulser
- 硬性: hardness; rigid; stiff; inflexible 硬性规定 rigid and inflexible rules; hard and fast rules; lay down hard and rigid rules
- 弹性管: elastic tube; plastic pipe; spring tube
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