废气必须从通路段排除。
The waste gases must be vented from the forehearth sections.
通过建立路段社会总收益函数，分析交通路网供需特性，给出了拥挤收费起点的一个解释。
Through building a function of social utility and analyzing supply-demand features of the traffic network, a new explanation of the congestion toll threshold is presented.
然而青藏铁路仍有大量路段未采用任何工程措施，因此修筑普通路基后冻土变化也是普遍关心的问题。
However, not all measures can be taken in many sections of the Qinghai-Tibet Railway; therefore, the variation of permafrost under an ordinary embankment must be paid attention to after construction.
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