13645
Pesticide use patterns in China have changed in recent years ; however , the study of the environmental fate of current - use pesticides ( CUPs ) and their ecotoxicological significance in aquatic ecosystems is limited .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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