The relatively few who use railways often are disproportionately well-off: three-fifths of the traffic is concentrated in the wealthy commuting counties of the south-east.

经常乘火车的人数相对较少，可是其中的富人比例却出奇地高，五分之三的列车集中于东南部的富人社区。

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During what the safety board described as a 'concentrated period of discussion' neither pilot monitored the progress of the airplane nor air-traffic control communications.

在这段被安全委员会形容为“聚精会神的讨论”过程中，两位飞行员都没有监控飞机的飞行进度，也没有检查地面塔台的通信。

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Research in the area of bridge design has been and still is concentrated on the study of the strength of materials and relatively few studies have been performed on traffic loads and their effects.

目前在桥涵设计的科研领域中，对材料和结构体系的研究占主导地位，而对于车辆荷载和以及车辆荷载效应的研究却相当少。

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At this time the issue appears to be the result of a concentrated effort to flood our corporate web site with traffic and slow access.

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The pilots said there was "a concentrated period of discussion where they did not monitor the airplane or calls" from air traffic control, though both said they heard conversation on the radio, the report said.

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