为解决交通问题，上海在交通设施方面下了大工夫，开辟了新的地铁线和隧道线，加宽了道路，改造了一些关键设施。
To copewith huge Expo crowds, the city has invested heavily in traffic infrastructureto dig new Metro lines and tunnels, expand roads and renovatekey facilities.
通过加宽导线与地线之间的距离，绝缘线与金属线之间的部分，把电线从干的顶部移开来减少高压线的危险。
Power lines can be made less dangerous by widening the gap between conducting and ground wires, insulating wires and metal parts, and moving wires farther away from pole tops.
在光谱管中原子间的碰撞是导致原子发射谱线加宽的重要原因之一。
The collisions between atoms in a spectral tube can be one of important Sources of emission-line broadening.
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