页岩气藏勘探技术属于世界级难题，技术创新潜力也很大。
The exploration of shale gas reservoir is very difficult, but the creative potential of the technique is also very big.
灰岩出露区的油气勘探属于世界级难题，是一个复杂的系统工程。
Limestone outcrop area of oil and gas exploration in the world-class problems, is a complex and systematic project.
一致性维护是设计和实现此类系统最具挑战性的一个世界级难题。
Consistency maintenance is one of the most significant challenges in designing and implementing real-time cooperative editing systems.
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