自由负重器械和机器负重器械都是受欢迎的力量训练工具，但它们不是唯一的选择，你可以用并不昂贵的阻力塑料管（译者：我猜是指用硬塑料管之类的代替拉力器啥的），或者甚至用自身体重进行力量训练（译者：俯卧撑嘛）。
Free weights and weight machines are popular strength training tools, but they're not the only options. You can do strength training with inexpensive resistance tubing or even your own body weight.
文件的硬(60rc)高强度铝合金管提供了一个平稳无腐蚀密封面和良好的耐磨性。
The file hard (60rc) high strength aluminum alloy tube provides a smooth corrosion free sealing surface and excellent abrasion resistance.
文件的硬（60RC）高强度铝合金叶管提供了一个平滑，无腐蚀耐磨密封面。
The file hard (60RC) high strength aluminum alloy lobe tube provides a smooth, corrosion-free abrasion-resistant sealing surface.
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