The heat transfer between residential units is a difficult technical problem in heat metering of central heating systems.
户间传热是集中供暖热计量中的一个技术难题。
In the highway construction on a soft foundation, the vehicles jumped at bridge approaches are a difficult technical problem.
在软土地基上修建高等级公路中，桥头跳车问题是一个技术难题。
In the highway construction on a soft foundation, the vehicles jumped at bridge approaches are a difficult technical problem.
在软土地基上修建高等级公路中，桥头跳车问题是一个技术难题。
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