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Repeated twisting, awkward postures, and heavy lifting can all contribute to back pain and injury.
重复扭动, 不正确姿势及提举重物均可引致背痛及损伤.
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进行钻杆管体探伤对防止钻杆刺漏及断裂事故的发生具有十分重要的意义.
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Sewing threads are made by twisting single yarns together to form a stronger thread.
缝纫线是由几股纱线合在一起纺成一股更加牢固的线.
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Care is needed when loading the roll to prevent twisting or kinking the film.
装胶卷时要小心,别使胶片扭结。
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