They can be long-winded, insensitive and impolite, often failing to look people in the eye.
他们说话啰嗦，感觉迟钝，行为粗鲁，不能正视别人的眼睛。
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These systems often work best when other approaches are failing.
当其它方法行不通时，这些系统通常是最佳方式。
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