Although it braked, the reversing truck still bumped a woman nearby who was bending and sweeping the street, and crushed the woman's arm, which was impossible to preserve.

虽然采取了刹车措施，这辆倒退的卡车仍然撞到了旁边正在弯腰扫地的妇女，压碎了她的手臂。这只手臂不可能保住了。

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The passage implies that reversing the muscle-bone movement used to bend an arm requires the use of different muscles.

这篇文章暗示我们手臂肌肉骨骼的回动的动作需要利用不同的机肉来完成。

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Salomon Smith Barney, the securities arm of financial services company Citigroup, recently said it would offer Internet trading later this year, reversing a previous policy of limiting clients' Internet access to research and portfolio checking.

BBC: News | Your Money | Merrill Lynch moves online