Reinforcement: a braid of textile material over the inner tube and four spiral plies of heavy steel wire wrapped in alternating direction.
加强层：四层交互缠绕的高强度钢丝和包覆在内胶外的纤维编织层。
Reinforcement: a braid of textile material over the inner tube and four spiral plies of heavy steel wire wrapped in alternating direction.
加强层：四层交互缠绕的高强度钢丝和包覆在内胶外的纤维编织层。
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