中江地区沙溪庙组地层在钻井过程中一直存在比较严重的垮塌现象，给该区钻井施工带来较大的技术难题和经济上造成较大损失。
Serious collapsing is always existed in the drilling process in Shaximiao formation of Zhongjiang area, which brings technical difficulty in drilling operation and huge economic loss.
蒸汽发生器水位控制系统是非线性、时变的多变量系统，“虚假液位”现象的存在使蒸汽发生器液位控制成为一个难题。
Steam generator level is a non-linear, mutative and multi-variable system. It is a problem to design the control system because of "false level".
超速行驶是世界各国普遍存在的交通现象和交通管理难题。
Speeding driving is a fairly popular phenomenon in the world and hard to deal with for traffic enforcement.
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