一定要长期坚持，当遇到内心难以解决的困惑时，可以翻看之前的记录，寻找相似的状态，看看当时的自己是如何克服的。
Must insist for a long time, when the heart is difficult to solve the puzzle, can look at the previous record, looking for a similar state, look at how they are overcome.
在化学工业和能源生产中，结垢是一个长期存在而又难以解决的实际问题。
In chemical industry and energy production, scale is a long-standing and actual difficult problem.
这两本书都解决了史学家和姓氏学家长期迷惘而难以解决的一些问题。
Both the two books have solved some of the problems that puzzled historians and surname experts for a long time.
我国海上油气勘探长期存在着用纵波地震勘探难以解决的地震模糊带和岩性假亮点等问题。
For the offshore petroleum exploration in China, it has long existed that the fuzzy zones and lithological false bright spots can't be eliminated by the P_wave seismic exploration.
我国海上油气勘探长期存在着用纵波地震勘探难以解决的地震模糊带和岩性假亮点等问题。
For the offshore petroleum exploration in China, it has long existed that the fuzzy zones and lithological false bright spots can't be eliminated by the P_wave seismic exploration.
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