The calculating theory and designing method of pre-stress reinforcement concrete structure plasticity is one of thorny problem that the theory circle and project circle pays close attention to.
These challenges still remain. In our economic and social development, we face many thorny problems seldom seen anywhere else in the world.
This thorny problem on the invironmental protection floored the new mayor.
Here's a thorny problem: to develop an objective way to rank countries according to the quality of life they offer their citizens.
Modern technology has created some thorny problems (Can a particle accelerator open up a cataclysmic black hole that will destroy the Earth?
It is an thorny problem how to choose proper words as the subject of a sentence in Chinese-English translation.
Technical thorny problems met during construction of cast-in-situ piles at riprap backfilling area and corresponding countermeasures are expounded to serve as a reference for similar engineering.
The effect of atmospheric refraction error on observed value is a very thorny problem in EDM trigonometric leveling.
Race relations in the USA continue to be a thorny problem.
In our economic and social development, we face many thorny problems seldom seen anywhere else in the world. None of them is easy to solve in a country with 1.3 billion people.
General Motors, which emerged from bankruptcy on Friday, now must tackle its next thorny problem - its own management team.
In campus afforestation, the two thorny problems are big trees transplanting and lawns interplanting.
The American government, like every government, has its share of thorny problems.
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