a difficult technical problem 一个难题 solve a particular technical problem 解决特定技术问题 solve a difficult technical problem 攻克技术难关 .
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In the highway construction on soft foundation, "bump at bridge-head" is a difficult technical problem.
在软土地基修建高等级公路中，“桥头跳车问题”是一个技术难题。
In the highway construction on soft foundation, "bump at bridge-ends" is a difficult technical problem.
在软土地基修建高等级公路中，“桥头跳车问题”是一个技术难题。
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。
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