oversupply ['əʊvəsə'plaɪ]

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n.供应过量；v.过度供给

a greater supply of something than is needed

The market softened because of oversupply. 市场因供过于求而疲软。
Overexpansion of tea fields has led to oversupply. 茶园过度扩张，使得市场上逐渐供过于求。