How to treat sludge from sewage treatment plant is a big difficult problem faced by big or middling cities.
如何处置污水处理厂产出的污泥是世界各大、中城市面临的一大难题。
Indeed, when you are faced with a difficult problem, such as a math problem, feeling depressed is often a useful response that may help you analyze and solve it.
确实，当你面对一个非常困难的问题时，例如一道数学难题，感到抑郁通常会帮助你更加有效的分析和解决它。
Such problems as lithological discrimination, reservoir zonation and geological parameter calculation have been faced with a difficult problem on log evaluation of the glutinite formation.
东营凹陷北部陡坡带砂砾岩体广泛发育，该类地层的岩性识别、储层划分、地质参数计算等一直是测井评价所面临的难题。
Though the question of the difficulty of execution will become history one day in the future, but it is a difficult problem that must be faced together at the present stage at least.
或许有一天“执行难”问题会成为过去，但至少现阶段它是一道必须面对的难题。
Supply chain risk is becoming a challenge of present supply chain management, how to adopt effective prevention measures is a difficult problem that faced of the enterprise and the experts of SC.
当前供应链风险是供应链管理面临的一大挑战，如何采取有效的预防和规避措施是企业和供应链研究专家面临的一大难题。
Supply chain risk is becoming a challenge of present supply chain management, how to adopt effective prevention measures is a difficult problem that faced of the enterprise and the experts of SC.
当前供应链风险是供应链管理面临的一大挑战，如何采取有效的预防和规避措施是企业和供应链研究专家面临的一大难题。
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