如何提高小井眼固井质量是困扰钻井行业多年的老问题。
How to improve the quality of slim hole cementing is a difficult problem of perplexing well drilling.
螺旋埋弧焊钢管内焊缝裂纹是本行业多年未解决的问题。
Inside welding seam cracking of spiral submerged Arc welded pipe is the unsolved problem for many years in the pipe field.
我从事医疗行业多年，但我只能很惭愧地说，我没有注意到(她患上抑郁症)的征兆。
I have been in the health care profession for many years and am ashamed to say I missed the warning signs.
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