Declining water quality is a major factor in the pollution of the Great Barrier Reef.
水质下降是在大堡礁污染的主要因素。
The heavy metals pollution in agricultural soil of Guangdong is mainly caused by artificial factor, soil parent materials and the diversity of water quality in different area.
人为因素、成土母质和不同流域水质差异是造成广东典型区域农业土壤重金属污染的原因。
The East Route of water diversion should be completed by 2010, and pollution control to ensure diverted water quality is a key factor to guarantee the project successful.
南水北调东线工程计划在2010年建成，能否根治污染、确保调水水质，是其成败的关键。
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