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.
研究了鞍型板加强的Y型管节点在轴向拉力的作用下的极限强度。
The ultimate strength of doubler plate reinforced Y-joints subjected to tension loading in studied.
如果挠性管从卷筒上放出并停歇时没有施加任何拉力，在这种情况下一段挠性管柱将会采取的自然形状。
The natural form that a section of coiled tubing string will take if spooled from the reel and allowed to rest without any tension applied.
目的：对比研究空心拉力螺钉与管型石膏治疗新鲜腕舟骨骨折，评价空心拉力螺钉手术方法的临床疗效。
Objective: Through comparative study hollow tension screw and plaster cast asked for fresh scaphoid bone fracture, to evaluate the clinical efficacy of the hollow tension screw surgical methods.
目的：对比研究空心拉力螺钉与管型石膏治疗新鲜腕舟骨骨折，评价空心拉力螺钉手术方法的临床疗效。
Objective: Through comparative study hollow tension screw and plaster cast asked for fresh scaphoid bone fracture, to evaluate the clinical efficacy of the hollow tension screw surgical methods.
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