...ll)是世界第五大瀑布，虽没有尼亚加拉大瀑布的壮丽但也别有一番风味，是一种不同的、静谧之美。在隧道观景点(Tunnel View Point)处我们还看到鬼斧神工的半圆山(Half Dome)。虽然有点累但真的很值得。
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This paper made some investigation about the permissible concentration limits about contaminations in roadway tunnel from the point of view of the effects on the body.
本文针对该隧洞的特点依据保障隧道内乘驶机动车各人员健康、卫生和隧道的营运安全为原则对污染物浓度设计限值进行了研究。
The safety situation of karst tunnel is the most serious and headache problem from the point of view of safety situation in construction industry field.
从建筑业的安全现状分析，岩溶隧道的安全现状最令人担忧。
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