分析了既有货车提速改造上旁承组装存在的问题及原因，并提出了相应的解决措施。
The problems existing in reform of the upper side bearings assembly on present freight cars and the causes are analyzed.
旧金山经常发生大地震， 海湾大桥 作为城市地标和交通主干线，能否经受地震的考验？ 为了确保交通顺畅，美国正在海湾大桥旁修建一座世界上最大的自承式悬索桥。
San Francisco has its share of massive earthquakes, but the Bay Bridge, one of the city’s main transit arteries, is not as quake-safe as you’d hope.
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