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。
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。
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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